ci/appveyor: re-enable parallel mode #1294
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The comment cited earlier is no longer true with recent CMake versions.
This options does actually enable parallel builds with MSVC since CMake
v3.26.0: https://gitlab.kitware.com/cmake/cmake/-/issues/20564
The effect isn't much for libssh2, because it spends most time in tests,
but let's enable it anyway for efficiency.
Ref: 0d08974 #884
Ref: 7a039d9 #867
Closes #1294