gnu: xf86-video-intel: Update to 2.21.15.

* gnu/packages/patches/xf86-video-intel-compat-api.patch,
  gnu/packages/patches/xf86-video-intel-glibc-2.20.patch: New files.
* gnu-system.am (dist_patch_DATA): Add them.
* gnu/packages/xorg.scm (xf86-video-intel): Update to 2.21.15.
  Add patches.  Add eudev to inputs.

gnu-system.am

@@ -463,6 +463,8 @@ dist_patch_DATA =						\
   gnu/packages/patches/xf86-video-geode-glibc-2.20.patch	\
   gnu/packages/patches/xf86-video-glint-remove-mibstore.patch	\
   gnu/packages/patches/xf86-video-i128-remove-mibstore.patch	\
+  gnu/packages/patches/xf86-video-intel-compat-api.patch	\
+  gnu/packages/patches/xf86-video-intel-glibc-2.20.patch	\
   gnu/packages/patches/xf86-video-openchrome-includes.patch	\
   gnu/packages/patches/xfce4-panel-plugins.patch		\
   gnu/packages/patches/xmodmap-asprintf.patch

gnu/packages/patches/xf86-video-intel-compat-api.patch

@@ -0,0 +1,13 @@
+This patch was copied from Debian.
+
+--- xserver-xorg-video-intel-2.21.15.orig/src/compat-api.h
++++ xserver-xorg-video-intel-2.21.15/src/compat-api.h
+@@ -158,4 +158,8 @@
+ 	if ((d)->pScreen->SourceValidate) (d)->pScreen->SourceValidate(d, x, y, w, h)
+ #endif
+ 
++#if XORG_VERSION_CURRENT >= XORG_VERSION_NUMERIC(1,14,99,2,0)
++#define DamageUnregister(d, dd) DamageUnregister(dd)
++#endif
++
+ #endif

gnu/packages/patches/xf86-video-intel-glibc-2.20.patch

@@ -0,0 +1,15 @@
+Allow builds with glibc 2.20.
+Based on a patch by Peter Hutterer <peter.hutterer@who-t.net>.
+See <https://raw.githubusercontent.com/openembedded/oe-core/master/meta/recipes-graphics/xorg-driver/xf86-input-synaptics/always_include_xorg_server.h.patch>.
+
+--- xf86-video-intel-2.21.15/src/intel_device.c.~1~	2013-08-09 16:58:48.000000000 -0400
++++ xf86-video-intel-2.21.15/src/intel_device.c	2014-12-18 00:03:54.700759577 -0500
+@@ -33,6 +33,8 @@
+ 
+ #include <sys/ioctl.h>
+ 
++#include <xorg-server.h>
++
+ #include <pciaccess.h>
+ #include <xf86.h>
+ #include <xf86drm.h>

gnu/packages/xorg.scm

@@ -2585,19 +2585,22 @@ devices, thus making direct access unnecessary.")
 (define-public xf86-video-intel
   (package
     (name "xf86-video-intel")
-    (version "2.19.0")
+    (version "2.21.15")
     (source
       (origin
         (method url-fetch)
         (uri (string-append
-               "mirror://xorg/X11R7.7/src/everything/xf86-video-intel-"
+               "mirror://xorg/individual/driver/xf86-video-intel-"
                version
                ".tar.bz2"))
         (sha256
           (base32
-            "1g742szymajh88a5dw08sxcr45bmxgc4w3m6hddv9qscn5hks4rj"))))
+           "1z6ncmpszmwqi9xr590c4kp4gjjf7mndcr56r35x2bx7h87i8nkx"))
+        (patches (list (search-patch "xf86-video-intel-compat-api.patch")
+                       (search-patch "xf86-video-intel-glibc-2.20.patch")))))
     (build-system gnu-build-system)
     (inputs `(("mesa" ,mesa)
+              ("udev" ,eudev)
               ("libx11" ,libx11)
               ("xorg-server" ,xorg-server)))
     (native-inputs