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cmake: fix AppleClang detection

CMake 3.0 and above recognize that Apple Clang is a different compiler
than upstream Clang. CMake 4.0 prefers to set the
`CMAKE_<LANG>_COMPILER_ID` variable to AppleClang instead of Clang.
See [1] for details.

This patch adds the corresponding check to set `CMAKE_COMPILER_IS_CLANG`
for the Apple Clang too.

[1]: https://cmake.org/cmake/help/v4.0/policy/CMP0025.html

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