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AppVeyor: test more build combinations #3104
No tests are run for the WinSSL and OpenSSL builds yet because of curl-config test failures similar to #1262. For all other builds, the tests are run.
No VS 2017 builds yet as 1) it requires a non-default image with a limited software environment I have to test yet and 2) it is still a moving target regarding compiler warnings and standards conformance (this probably affects C++ much more than C, though).