build-openssl.bat: Refer to VS2017 as VC14.1 instead of VC15
.. and do the same for build-wolfssl.bat. Because MS calls it VC14.1. Closes https://github.com/curl/curl/pull/2189
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.. and do the same for build-wolfssl.bat. Because MS calls it VC14.1. Closes https://github.com/curl/curl/pull/2189