cerbero: Fix library search function
cerbero: Fix library search function

It was using insufficient/broken logic and calling 'ls' which is much
slower than just doing glob.glob especially on Windows.

It now matches all possible DLLs, SOs, and Dylibs exactly using a regex and also
warns if all the requested libraries weren't found.

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