Intel: When simulating MSVC, re-use Windows-MSVC (#14476)
Teach CMake(C|CXX|Fortran)CompilerId* to report the MSVC version simulated by the Intel compiler, if any. Refactor the Windows-Intel platform information helper module to load Windows-MSVC instead of duplicating the information. Teach Windows-MSVC to understand when it is loaded as the simulated Fortran compiler (its preprocessor is simulated).
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