android: Implement gst_init_static_plugins()
android: Implement gst_init_static_plugins()

This is the same symbol defined in libgstreamer-full and called by
gst_init().

Part-of: <https://gitlab.freedesktop.org/gstreamer/cerbero/-/merge_requests/629>

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