gnu: xf86-video-mga: Update to 1.6.3.

* gnu/packages/patches/xf86-video-mga-glibc-2.20.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/xorg.scm (xf86-video-mga): Update to 1.6.3.  Add patch.

gnu-system.am

@@ -466,6 +466,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/xf86-video-intel-compat-api.patch	\
   gnu/packages/patches/xf86-video-intel-glibc-2.20.patch	\
   gnu/packages/patches/xf86-video-mach64-glibc-2.20.patch	\
+  gnu/packages/patches/xf86-video-mga-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-mga-glibc-2.20.patch

@@ -0,0 +1,17 @@
+Fix test compilation with exa.h in configure when using glibc 2.20.
+Inspired by 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-mga-1.6.3/configure.~1~	2013-12-04 21:10:25.000000000 -0500
++++ xf86-video-mga-1.6.3/configure	2014-12-19 01:06:23.005774736 -0500
+@@ -18464,7 +18464,9 @@
+ 
+     SAVE_CPPFLAGS="$CPPFLAGS"
+     CPPFLAGS="$CPPFLAGS $XORG_CFLAGS"
+-    ac_fn_c_check_header_mongrel "$LINENO" "exa.h" "ac_cv_header_exa_h" "$ac_includes_default"
++    ac_fn_c_check_header_mongrel "$LINENO" "exa.h" "ac_cv_header_exa_h" "$ac_includes_default
++#include <xorg-server.h>
++"
+ if test "x$ac_cv_header_exa_h" = xyes; then :
+   have_exa_h="yes"
+ else

gnu/packages/xorg.scm

@@ -2641,17 +2641,18 @@ devices, thus making direct access unnecessary.")
 (define-public xf86-video-mga
   (package
     (name "xf86-video-mga")
-    (version "1.5.0")
+    (version "1.6.3")
     (source
       (origin
         (method url-fetch)
         (uri (string-append
-               "mirror://xorg/X11R7.7/src/everything/xf86-video-mga-"
+               "mirror://xorg/individual/driver/xf86-video-mga-"
                version
                ".tar.bz2"))
         (sha256
           (base32
-            "03l3wz5kz0hmxmzqqbkgn7pf9d956jlag04rb701a0fr1mw3v66a"))))
+           "1my7y67sadjjmab1dyxckylrggi7p01yk4wwg9w6k1q96pmb213p"))
+        (patches (list (search-patch "xf86-video-mga-glibc-2.20.patch")))))
     (build-system gnu-build-system)
     (inputs `(("mesa" ,mesa)
               ("xf86driproto" ,xf86driproto)