gst-plugins-base: Enable opengl plugin on UWP
gst-plugins-base: Enable opengl plugin on UWP

Part-of: <https://gitlab.freedesktop.org/gstreamer/cerbero/-/merge_requests/538>

nirbheek/cerbero,GStreamer/cerbero,GStreamer/cerbero,GStreamer/cerbero,nirbheek/cerbero,nirbheek/cerbero,GStreamer/cerbero,GStreamer/cerbero,nirbheek/cerbero