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pkgconfig: fix meson warnings about GL_CFLAGS in gstreamer-gl .pc files

Tim-Philipp Müller requested to merge tpm/gst-plugins-base:fix-gl-cflags-pkg-config-warnings into master

We added GL_CFLAGS in autotools because we unconditionally included OpenGL headers. We do not do that anymore for a standard #include <gst/gl/gl.h>. OpenGL headers are only included for the platform specific files e.g. #include <gst/gl/x11/gstgldisplay_x11.h> which must always be hidden behind a #if GST_GL_HAVE_WINDOW_X11, or #include <gst/gl/gstglfuncs.h> to gain access to the contents of the GstGLFuncs object.

Users of our headers must include the necessary include paths for the platforms they are intending to support.

We might introduce extra .pc files for what GstGL was built against though.

Fixes #735 (closed)

cc @ystreet

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