svn r51: - Fix to use the proper pthread-win32 library name ('libpthreadGC2.a') with MinGW
svn r51: - Fix to use the proper pthread-win32 library name ('libpthreadGC2.a') with MinGW

nonolith/libusb,nonolith/libusb,pbatard/libusb-pbatard,pbatard/libusb-pbatard,nonolith/libusb