[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 #5 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
I'm not arguing against the usefulness of pkg-config files, they are definitely
useful. Just that for GL this seems a rather annoying change for two reasons:
1) people were using their own checks based on headers/libs since decades and
on other platforms we still need them
2) non-pkg-config checks are going to fail now because a special #define is
needed that is given in the pkg-config file only

I would say that 2) is something that mesa should really fix unless they want
to make many people unhappy because suddenly their software fails to build.
Nonetheless it would make sense from our side to use pkg-config if available,
and fall back to other checks otherwise. If someone wants to provide a patch.

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