GL: Update glext.h to Revision 29735 (20150202).

Khronos modified glext.h to get rid of GL_TEXTURE_BINDING, a special enum
added for ARB_direct_state_access.  This enum was ruled unimplementable.

Reviewed-by: Brian Paul <brianp@vmware.com>
Tested-by: Laura Ekstrand <laura@jlekstrand.net>
1 file changed