Mesa recently updated the <GL/glext.h> header version to Khronos version 85.

This caused the PFNGLMULTITEXCOORD2FPROC definition to be moved out of the
GL_VERSION_1_3_DEPRECATED block. However, since <GL/gl.h> also defines
GL_VERSION_1_3 to 1, the definitions in <GL/glext.h> are then not enabled,
thus leaving PFNGLMULTITEXCOORD2FPROC undefined as well.

Provide a PFNGLMULTITEXCOORD2FPROC replacement as an interim solution for
newer versions of the <GL/glext.h> header.

Patch taken from: http://gitorious.org/vaapi/gstreamer-vaapi/commit/5db2e93d3c930fd8470cfdcd26f514d1cebc59a0?format=patchSigned-off-by: Jean-Paul Saman <jpsaman@videolan.org>

src/utils_glx.h

@@ -25,6 +25,13 @@
 #include <GL/glext.h>
 #include <GL/glx.h>
 
+#if GL_GLEXT_VERSION >= 85
+/* XXX: PFNGLMULTITEXCOORD2FPROC got out of the GL_VERSION_1_3_DEPRECATED
+   block and is not defined if GL_VERSION_1_3 is defined in <GL/gl.h>
+   Redefine the type here as an interim solution */
+typedef void (*PFNGLMULTITEXCOORD2FPROC) (GLenum target, GLfloat s, GLfloat t);
+#endif
+
 #ifndef GL_FRAMEBUFFER_BINDING
 #define GL_FRAMEBUFFER_BINDING GL_FRAMEBUFFER_BINDING_EXT
 #endif
@@ -44,6 +51,7 @@
 #define GL_PROGRAM_UNDER_NATIVE_LIMITS GL_PROGRAM_UNDER_NATIVE_LIMITS_ARB
 #endif
 
+
 const char *
 gl_get_error_string(GLenum error)
     attribute_hidden;