meson: link remoting with glib and gobject

remoting-plugin.c calls things like g_error_free() and g_object_set(), so it
needs to link glib-2.0 and gobject-2.0 explicitly, instead of relying on
GStreamer pkg-config bringing them in.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
(cherry picked from commit 292aaf93)