[Bug 751068] gl: Use pkg-config if found to configure GL/EGL/GLES (as provided by mesa and libmali)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=751068

--- Comment #7 from Nicolas Dufresne (stormer) <nicolas.dufresne at collabora.co.uk> ---
Created attachment 317397
  --> https://bugzilla.gnome.org/attachment.cgi?id=317397&action=edit
opengl: Use pkg-config if available

libMesa ships .pc files now for gl/egl/glesv2. This patch makes use
of it while keeping support for system without.

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