Fix compilation of tests with `/std:c++17`#2292

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YannickJadoul wants to merge 3 commits intopybind:masterfrom YannickJadoul:appveyor-msvc-c++17

+18-14

Commits on Jul 11, 2020

Change /std:c++latest flag to /std:c++17 and quote it, since CMake otherwise doesn't seem to pick it up
YannickJadoul
committed

Commits on Jul 12, 2020

Don't use $<COMPILE_LANGUAGE:CXX> to add PYBIND11_CPP_STANDARD for VS CMake generators
YannickJadoul
committed

Commits on Jul 13, 2020

Debugging non-failure of /std:c++17
YannickJadoul
committed