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728de353be
the current implementation has two problems:
* `clang-cl` does not know `-ffile-prefix-map`, but in CMake it is
reported as "Clang", so the compiler will warn about an unknown
compiler option.
* XCode's clang in CMake is reported as "AppleClang", so it is not picked
up as "Clang", so it is not passed `-ffile-prefix-map`, even though
it supports it.
Also changed the map so that the normalized `__FILE__` paths are the same
as what the approval tests normalize paths into.
Co-authored-by: Martin Hořeňovský <martin.horenovsky@gmail.com>