Apply the refactoring from commit 70728398 (VS: Use AddLanguageFlags
to de-duplicate CMAKE_<LANG>_FLAGS* lookup, 2019-04-01,
v3.15.0-rc1~300^2) to the CUDA, ASM_MASM, and ASM_NASM languages too.
In particular, CUDA needs the MSVC runtime library selection logic
in the `AddLanguageFlags` method that is used by other generators.