[libusb] Two patches from MSYS2 against libusb-compat

[Xiaofan C. <xia...@gm...>]

Hi,

People in OpenOCD project wish the following two MSYS2
patches to reviewed and applied in libusb-compat so that
libusb-compat can be built under MSYS2 using MinGW-w64.
https://github.com/Alexpux/MINGW-packages/tree/master/mingw-w64-libusb-compat-git

Please help to review. Thanks.

-- 
Xiaofan