/usr/i686-w64-mingw32/include/ddk/hidclass.h is in mingw-w64-i686-dev 5.0.3-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/i686-w64-mingw32/include/ddk/../../../share/mingw-w64/include/ddk/hidclass.h