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Genex: Enable COMPILE_LANGUAGE for preprocessor setting in VS and Xcode

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

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_DEFINITIONS and INCLUDE_DIRECTORIES to match the selected language.

This is not exactly the same as for other generators, but is the best VS and Xcode can do. It is also sufficient for many use cases since the set of definitions and include directories for C and C++ is frequently similar but may be distinct from those for other languages like CUDA.

Fixes: #17435 (closed)

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