cxx,c++: Remove c++14 references
- MSVC C++14 support obtained from: https://learn.microsoft.com/en-us/cpp/overview/visual-cpp-language-conformance?view=msvc-170
- _MSVC_VER taken from https://stackoverflow.com/a/70630/2420872
fixes: #754 (closed)
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fixes: #754 (closed)