gstreamer-1.0: Add libunwind to the files list if variant is selected
gstreamer-1.0: Add libunwind to the files list if variant is selected

shoreflyer/cerbero,OptoFidelity/cerbero,justinjoy/cerbero,nirbheek/cerbero,shoreflyer/cerbero,EricssonResearch/cerbero,OptoFidelity/cerbero,EricssonResearch/cerbero,justinjoy/cerbero,GStreamer/cerbero,justinjoy/cerbero,nirbheek/cerbero,justinjoy/cerbero,atsushieno/cerbero,flexVDI/cerbero,EricssonResearch/cerbero,shoreflyer/cerbero,nirbheek/cerbero,shoreflyer/cerbero,atsushieno/cerbero,centricular/cerbero,centricular/cerbero,flexVDI/cerbero,GStreamer/cerbero,GStreamer/cerbero,shoreflyer/cerbero,fluendo/cerbero,centricular/cerbero,atsushieno/cerbero,flexVDI/cerbero,GStreamer/cerbero,atsushieno/cerbero,atsushieno/cerbero,GStreamer/cerbero,EricssonResearch/cerbero,flexVDI/cerbero,OptoFidelity/cerbero,fluendo/cerbero,centricular/cerbero,centricular/cerbero,OptoFidelity/cerbero,nirbheek/cerbero,fluendo/cerbero,EricssonResearch/cerbero,fluendo/cerbero,fluendo/cerbero,flexVDI/cerbero