Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=54699
I added the complete `windows.networking.idl` file since it was small and in case it's needed for mingw build.
-- v2: windows.networking.hostname: Implement IHostName::get_RawName(). windows.networking.hostname: Implement IHostNameFactory::CreateHostName(). windows.networking.hostname/tests: Add IHostNameFactory::CreateHostName() tests.