depstracker: fix regression listing dependencies in macOS
depstracker: fix regression listing dependencies in macOS

This regression was introduced with the new relocation system in
macOS that replaces the prefix with @rpath.

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