Function xorgGlxCreateVendor() is defined in glx_extinit.h, if this header is
not included, we might get either error or warning. This header also need to
be included after scrninststr.h header as it defines some structures used
in glx_extinit.h
(cherry picked from commit
8c6c584377feba0e3b99eecb3ef33b28cee318cb)
#include <X11/Xproto.h>
#include <X11/Xos.h>
#include "scrnintstr.h"
+#if XORG >= 120
+#include "glx_extinit.h"
+#endif
#include "servermd.h"
#include "fb.h"
#include "mi.h"