[Bug 781885] Do not rely on gl3ext.h being available when finding gl3.h

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=781885

--- Comment #7 from Jens Georg <mail at jensge.org> ---
Created attachment 351609
  --> https://bugzilla.gnome.org/attachment.cgi?id=351609&action=edit
v3 - check for gl3ext.h existence

I also have a patch for the meson part, but I cannot test that

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