gnu: mupen64plus-video-z64: Fix glew.h location.

* gnu/packages/patches/mupen64plus-video-z64-glew-correct-path.patch: New file.
* gnu/local.mk (dist_patch_DATA): Add it.
* gnu/packages/emulators.scm (mupen64plus-video-z64)[source]: Use it.

gnu/local.mk

@@ -935,6 +935,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/mupdf-CVE-2018-6544.patch		\
   %D%/packages/patches/mupdf-CVE-2018-1000051.patch		\
   %D%/packages/patches/mupen64plus-ui-console-notice.patch	\
+  %D%/packages/patches/mupen64plus-video-z64-glew-correct-path.patch    \
   %D%/packages/patches/mutt-store-references.patch		\
   %D%/packages/patches/net-tools-bitrot.patch			\
   %D%/packages/patches/netcdf-date-time.patch			\

gnu/packages/emulators.scm

@@ -882,7 +882,8 @@ Rice Video plugin.")
              version ".tar.gz"))
        (file-name (string-append name "-" version ".tar.gz"))
        (sha256
-        (base32 "1x7wsjs5gx2iwx20p4cjcbf696zsjlh31qxmghwv0ifrq8x58s1b"))))
+        (base32 "1x7wsjs5gx2iwx20p4cjcbf696zsjlh31qxmghwv0ifrq8x58s1b"))
+       (patches (search-patches "mupen64plus-video-z64-glew-correct-path.patch"))))
     (build-system gnu-build-system)
     (native-inputs
      `(("pkg-config" ,pkg-config)

gnu/packages/patches/mupen64plus-video-z64-glew-correct-path.patch

@@ -0,0 +1,36 @@
+From 21507b3600c616bca7049004eb518cf11f45f299 Mon Sep 17 00:00:00 2001
+From: "Anthony J. Bentley" <anthony@cathet.us>
+Date: Sun, 7 Jun 2015 02:41:28 -0600
+Subject: [PATCH] Correct the path to the GLEW header.
+
+---
+ src/glshader.cpp | 2 +-
+ src/rgl.h        | 2 +-
+ 2 files changed, 2 insertions(+), 2 deletions(-)
+
+diff --git a/src/glshader.cpp b/src/glshader.cpp
+index 4729945..a8947ea 100644
+--- a/src/glshader.cpp
++++ b/src/glshader.cpp
+@@ -23,7 +23,7 @@
+ #include <stdio.h>
+ #include <string.h>
+ #include "rgl_assert.h"
+-#include <glew.h>
++#include <GL/glew.h>
+ #if defined(__MACOSX__)
+ #include <OpenGL/gl.h>
+ #include <OpenGL/glext.h>
+diff --git a/src/rgl.h b/src/rgl.h
+index c15f93f..1748406 100644
+--- a/src/rgl.h
++++ b/src/rgl.h
+@@ -26,7 +26,7 @@
+ #include "rgl_assert.h"
+ #include "rdp.h"
+ 
+-#include <glew.h>
++#include <GL/glew.h>
+ #if defined(__MACOSX__)
+ #include <OpenGL/gl.h>
+ #elif defined(__MACOS__)