When cross-compiling, locateFile() needs to look into the XQMAKESPEC
directories instead. Otherwise, this will cause checkAvailability()/findFile()
to report wrong results.
Change-Id: Ia1b566b70cff039d8fd540bde3c7b4707338348a
Reviewed-by: Oswald Buddenhagen <oswald.buddenhagen@theqtcompany.com>