Handle compiler arguments during first CMake invocation

Fred Baksikrequested to merge
fred23/cmake:compiler_flags into master

Resolve differences in behavior with ENV{CC} and CMAKE_<LANG>_COMPILER when the user provides both the compiler and multiple arguments. Also consider compiler arguments provided via CMAKE_<LANG>_FLAGS_INIT when performing compiler identification.

Fixes: #20089 (closed)

Edited by Kitware Robot

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