This finally fixes our duplicated getopt functions from different sources and gives us an up to date and the most compatible implementation.
isohybrid actually relies on a glibc-specific getopt behavior that we previously hacked into the reactos_support_code.c implementation derived from BSD/mingw-w64.
widl also needs getopt and previously used an even older BSD-derived code.
b42a155 widl: Handle C++ aggregate returns in a MSVC compatible way.
084fa63 widl: Only generate Proxy Stubs when functions have the call_as attribute.
fbdf119 widl: Try to find imported typelib using .tlb extension if it wasn't specified.
