recipes/taglib: explicitly disable detection for Boost
recipes/taglib: explicitly disable detection for Boost

We don't build or distribute Boost so detecting it is pointless.

Fixes finding Boost in the host system when cross-compiling and
the build failing

centricular/cerbero,flexVDI/cerbero,fluendo/cerbero,fluendo/cerbero,GStreamer/cerbero,GStreamer/cerbero,atsushieno/cerbero,atsushieno/cerbero,EricssonResearch/cerbero,flexVDI/cerbero,EricssonResearch/cerbero,fluendo/cerbero,flexVDI/cerbero,atsushieno/cerbero,nirbheek/cerbero,centricular/cerbero,flexVDI/cerbero,centricular/cerbero,GStreamer/cerbero,EricssonResearch/cerbero,nirbheek/cerbero,atsushieno/cerbero,fluendo/cerbero,fluendo/cerbero,centricular/cerbero,GStreamer/cerbero,centricular/cerbero,GStreamer/cerbero,EricssonResearch/cerbero,atsushieno/cerbero,EricssonResearch/cerbero,flexVDI/cerbero,nirbheek/cerbero,nirbheek/cerbero