[Bug 785010] meson: Fix GLES2 check

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785010

--- Comment #1 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 355730
  --> https://bugzilla.gnome.org/attachment.cgi?id=355730&action=edit
meson: Fix GLES2 check

On systems without pkg-config, we have the the library present but
not the headers

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