Revert "mesa_glinterop: remove inclusion of GLX header"

Revert "mesa_glinterop: remove inclusion of GLX header"

This reverts commit 8472045b16b3e4621553fe451a20a9ba9f0d44b6.

Conflicts:

	include/GL/mesa_glinterop.h

This patch fixes this build error with GCC 4.4.

  Compiling src/glx/dri_common_interop.c ...
In file included from src/glx/dri_common_interop.c:33:
include/GL/mesa_glinterop.h:62: error: redefinition of typedef ‘GLXContext’
include/GL/glx.h:165: note: previous declaration of ‘GLXContext’ was here

Fixes: 8472045b16b3 ("mesa_glinterop: remove inclusion of GLX header")
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=96770
Signed-off-by: Vinson Lee <vlee@freedesktop.org>