osx/ios: Don't include the arch path for non-universal builds

We build everything with libdir=lib, not lib/$arch. Things fail
if we move libraries around because Mach binaries have the complete
path to the library embedded instead of just the soname.

Also prevents us from creating some dead links...

There was probably a reason for this code originally, but nowadays
it just breaks. Leave it there but commented out.
base-system: Include typelibs for gobject-introspection

Otherwise we won't have GLib-2.0, which is a bit suboptimal.
gstreamer-core: Include typelibs for gst-plugins-base and gst-plugins-bad
gstreamer-1.0-net: Include typelibs for gst-rtsp-server
openwebrtc: Use correct SDK version and make sure to include the base system
gst-plugins-bad: Include the GstGL-1.0 typelib
openwebrtc: Include Owr-0.1 typelib on the relevant archs