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Genex: Enable COMPILE_LANGUAGE for COMPILE_OPTIONS and file(GENERATE) with Visual Studio

Brad King requested to merge brad.king/cmake:extend-compile-language-genex into master

Since !996 (merged) the evaluation of COMPILE_LANGUAGE receives the proper language. The set of compile flags used for a target's C and C++ sources is based on the linker language. By default this is always the C++ flags if any C++ sources appear in the target, and otherwise the C flags. Therefore we can define the COMPILE_LANGUAGE generator expression in COMPILE_OPTIONS to match the selected language.

This is not exactly the same as for other generators, but is the best VS can do. It is also sufficient for many use cases since the set of allowed flags for C and C++ is almost the same in Visual Studio. Furthermore, since the VS generator moves many of the flags to declarative .vcxproj elements, it will automatically avoid passing C++ flags for C sources.

Also enable COMPILE_LANGUAGE for file(GENERATE). It requires no special new support and simply needs to have the rejection dropped.

Issue: #17435 (closed)

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