build: Compilation fixes for MinGW toolchain

[ManManson]

This changeset incorporates a few fixes for build errors and warnings found when building GNS via llvm-mingw toolchain:

• TraceLoggingProvider: Disable for MinGW builds (MinGW-provided winapi headers differ from original WinSDK headers a lot, which poses a problem when trying to compile TraceLoggingProvider code)
• build: Fix compilation errors for cmsghdr-related things in MinGW builds (MinGW requires to include a different header file + need to alias WSACMSGHDR* to CMSGHDR/cmsghdr to avoid compilation errors)
• SteamNetworkingIPAddr: fix potentially dangerous -wcast-align warning in IsIPv6AllZeroes()