gnu: Remove broken xf86 video drivers.

Those packages build failed with current xorg-server:
  openchrome: multiple definition of some functions.
  other: missing headers for xf86RamDac.h, IBM.h, etc.

* gnu/packages/xorg.scm (xf86-video-glint, xf86-video-openchrome
xf86-video-suncg6, xf86-video-sunffb, xf86-video-tga
xf86-video-trident): Remove packages.
* gnu/packages/patches/xf86-video-tga-remove-mibstore.patch: Remove patch.
* gnu/local.mk (dist_patch_DATA): Remove it.

gnu/local.mk

@@ -2006,7 +2006,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/xf86-video-nouveau-fixup-ABI.patch	\
   %D%/packages/patches/xf86-video-savage-xorg-compat.patch 	\
   %D%/packages/patches/xf86-video-siliconmotion-fix-ftbfs.patch \
-  %D%/packages/patches/xf86-video-tga-remove-mibstore.patch	\
   %D%/packages/patches/xfce4-panel-plugins.patch		\
   %D%/packages/patches/xfce4-settings-defaults.patch		\
   %D%/packages/patches/xgboost-use-system-dmlc-core.patch       \

gnu/packages/patches/xf86-video-tga-remove-mibstore.patch

@@ -1,34 +0,0 @@
-Removes references to mibstore.h and miInitializeBackingStore, which
-have been removed from xorg-server.  Zack Rusin <zackr@vmware.com>
-wrote: "It was a noop for at least 5 years and it has been removed."
-See: http://patches.openembedded.org/patch/46133/
-
---- xf86-video-tga-1.2.2/src/tga_accel.c.~1~	2012-07-15 23:54:04.000000000 -0400
-+++ xf86-video-tga-1.2.2/src/tga_accel.c	2014-12-19 01:40:27.535913013 -0500
-@@ -37,7 +37,6 @@
- #include "xf86cmap.h"
- #include "mipointer.h"
- 
--#include "mibstore.h"
- #include "miline.h"
- 
- #include "tga_regs.h"
---- xf86-video-tga-1.2.2/src/tga_driver.c.~1~	2012-07-15 23:54:28.000000000 -0400
-+++ xf86-video-tga-1.2.2/src/tga_driver.c	2014-12-19 01:40:48.756018238 -0500
-@@ -46,8 +46,6 @@
- 
- /* software cursor */
- #include "mipointer.h"
--/* backing store */
--#include "mibstore.h"
- 
- /*  #include "mibank.h" */
- /* colormap manipulation */
-@@ -1451,7 +1449,6 @@
-     
-     fbPictureInit (pScreen, 0, 0);
-     
--    miInitializeBackingStore(pScreen);
-     xf86SetBackingStore(pScreen);
-     xf86SetSilkenMouse(pScreen);
- 

gnu/packages/xorg.scm

@@ -2841,30 +2841,6 @@ compositing.  Both support Xv overlay and dynamic rotation with XRandR.")
 ;;      "xf86-video-glide is a Glide video driver for the Xorg X server.")
 ;;     (license license:x11)))
 
-(define-public xf86-video-glint
-  (package
-    (name "xf86-video-glint")
-    (version "1.2.9")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (string-append
-               "mirror://xorg/individual/driver/xf86-video-glint-"
-               version
-               ".tar.bz2"))
-        (sha256
-          (base32
-           "1lkpspvrvrp9s539bhfdjfh4andaqyk63l6zjn8m3km95smk6a45"))))
-    (build-system gnu-build-system)
-    (inputs (list xorgproto xorg-server))
-    (native-inputs (list pkg-config))
-    (home-page "https://www.x.org/wiki/")
-    (synopsis "GLINT/Permedia video driver for X server")
-    (description
-     "xf86-video-glint is a GLINT/Permedia video driver for the Xorg
-X server.")
-    (license license:x11)))
-
 (define-public xf86-video-i128
   (package
     (name "xf86-video-i128")
@@ -3077,37 +3053,6 @@ supported, and the RENDER extension is not accelerated by this driver.")
 graphics cards.")
     (license license:x11)))
 
-(define-public xf86-video-openchrome
-  (package
-    (name "xf86-video-openchrome")
-    (version "0.6.0")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (string-append
-               "mirror://xorg/individual/driver/xf86-video-openchrome-"
-               version
-               ".tar.bz2"))
-        (sha256
-         (base32
-          "0x9gq3hw6k661k82ikd1y2kkk4dmgv310xr5q59dwn4k6z37aafs"))))
-    (build-system gnu-build-system)
-    (inputs (list libx11
-                  libxext
-                  libxvmc
-                  mesa
-                  xorgproto
-                  xorg-server))
-    (native-inputs
-     (list pkg-config))
-    (home-page "https://www.x.org/wiki/")
-    (synopsis "Openchrome video driver for X server")
-    (description
-     "xf86-video-openchrome is a video driver for the Xorg X server.
-This driver is intended for VIA chipsets featuring the VIA UniChrome,
-UniChrome Pro and Chrome9 integrated graphics processors.")
-    (license license:x11)))
-
 (define-public xf86-video-qxl
   (package
     (name "xf86-video-qxl")
@@ -3227,52 +3172,6 @@ Xorg X server.")
 This driver supports SiS chipsets of 300/315/330/340 series.")
     (license license:bsd-3)))
 
-(define-public xf86-video-suncg6
-  (package
-    (name "xf86-video-suncg6")
-    (version "1.1.3")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (string-append
-               "mirror://xorg/individual/driver/xf86-video-suncg6-"
-               version
-               ".tar.xz"))
-        (sha256
-          (base32
-            "16c3g5m0f5y9nx2x6w9jdzbs9yr6xhq31j37dcffxbsskmfxq57w"))))
-    (build-system gnu-build-system)
-    (inputs (list xorg-server))
-    (native-inputs (list pkg-config))
-    (home-page "https://www.x.org/wiki/")
-    (synopsis "GX/TurboGX video driver for X server")
-    (description
-     "xf86-video-suncg6 is a GX/TurboGX video driver for the Xorg X server.")
-    (license license:x11)))
-
-(define-public xf86-video-sunffb
-  (package
-    (name "xf86-video-sunffb")
-    (version "1.2.3")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (string-append
-               "mirror://xorg/individual/driver/xf86-video-sunffb-"
-               version
-               ".tar.xz"))
-        (sha256
-          (base32
-            "0pf4ddh09ww7sxpzs5gr9pxh3gdwkg3f54067cp802nkw1n8vypi"))))
-    (build-system gnu-build-system)
-    (inputs (list xorg-server))
-    (native-inputs (list pkg-config))
-    (home-page "https://www.x.org/wiki/")
-    (synopsis "SUNFFB video driver for X server")
-    (description
-     "xf86-video-sunffb is a SUNFFB video driver for the Xorg X server.")
-    (license license:x11)))
-
 (define-public xf86-video-tdfx
   (package
     (name "xf86-video-tdfx")
@@ -3296,54 +3195,6 @@ This driver supports SiS chipsets of 300/315/330/340 series.")
      "xf86-video-tdfx is a 3Dfx video driver for the Xorg X server.")
     (license license:x11)))
 
-(define-public xf86-video-tga
-  (package
-    (name "xf86-video-tga")
-    (version "1.2.2")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (string-append
-               "mirror://xorg/individual/driver/xf86-video-tga-"
-               version
-               ".tar.bz2"))
-        (sha256
-          (base32
-           "0cb161lvdgi6qnf1sfz722qn38q7kgakcvj7b45ba3i0020828r0"))
-        (patches (search-patches "xf86-video-tga-remove-mibstore.patch"))))
-    (build-system gnu-build-system)
-    (inputs (list xorgproto xorg-server))
-    (native-inputs (list pkg-config))
-    (home-page "https://www.x.org/wiki/")
-    (synopsis "TGA video driver for X server")
-    (description
-     "xf86-video-tga is a TGA (DEC 21030) video driver for the Xorg
-X server.")
-    (license license:x11)))
-
-(define-public xf86-video-trident
-  (package
-    (name "xf86-video-trident")
-    (version "1.3.8")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (string-append
-               "mirror://xorg/individual/driver/xf86-video-trident-"
-               version
-               ".tar.bz2"))
-        (sha256
-          (base32
-           "0gxcar434kx813fxdpb93126lhmkl3ikabaljhcj5qn3fkcijlcy"))))
-    (build-system gnu-build-system)
-    (inputs (list xorgproto xorg-server))
-    (native-inputs (list pkg-config))
-    (home-page "https://www.x.org/wiki/")
-    (synopsis "Trident video driver for X server")
-    (description
-     "xf86-video-trident is a Trident video driver for the Xorg X server.")
-    (license license:x11)))
-
 ;; no license
 ;; (define-public xf86-video-v4l