Don't add '-std=' options for Clang when it's simulating MSVC's cl.exe.

Ruben Van Boxemrequested to merge
rubenvb/cmake:issue-16266 into master

This should fix issue #16266 (closed).

Clang-cl outputs a warning for an ignored GNU-style argument. This patch does not add that argument for clang-cl, which follows whatever language features implemented by the Visual Studio version it is told to track.

Topic-rename: clang-cl-no-std

Edited by Brad King

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