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

[GStreamer (GNOME Bugzilla)]

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

            Bug ID: 781885
           Summary: Do not rely on gl3ext.h being available when finding
                    gl3.h
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: mail at jensge.org
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

For GLES3 there is no gl3ext.h header as defined by Khronos[1]

Even though MESA is supplying an empty one, compiling gst-plugins-bad fails
against OpenGL drivers that are not mesa-based and adhere to the Khronos
definition to only ship gl2ext.h, even for GLES3

[1] https://www.khronos.org/registry/OpenGL/index_es.php#specs32

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