[Bug 792043] include all OMX extension headers if present

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792043

--- Comment #7 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 367619
  --> https://bugzilla.gnome.org/attachment.cgi?id=367619&action=edit
meson: use include_directories() with external OMX headers path

It seems cleaner to use the proper meson tools to include this path
rather than manually tweak the build flags.

This also allows us to simplify the OMX extensions detection code. We
are now always checking which files are present, even when using our
internal copy of OMX, rather than hardcoding the ones present in it.

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