All Windows APIs have been natively UTF-16 since Windows 2000 and the
non-Unicode variants are just wrappers around them. Only Windows 9x
doesn't understand Unicode without the UnicoWS DLL. As later Visual
Studio versions cannot target Windows 9x anyway, using the ANSI API
doesn't really have any benefit there.
This avoids issues like KNOWN_BUGS 6.5.
Ref: https://github.com/curl/curl/issues/2120
Closes https://github.com/curl/curl/pull/3720
Starting with Visual Studio 2017 Update 9, Visual Studio doesn't like
the MinimalRebuild option anymore and warns:
cl : Command line warning D9035: option 'Gm' has been deprecated and
will be removed in a future release
The option can be safely removed so that the default is used.
Closes https://github.com/curl/curl/pull/3425
The Visual Studio builds didn't use IPv6. Add it to all projects since
Visual Studio 2008, which is verified to build via AppVeyor.
Closes https://github.com/curl/curl/pull/3137
