VS projects: add USE_IPV6
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
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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