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fix: relative path handling for clang PCH header
cmake may generate both -include and -include-pch. Example: c++ ... -Xclang -include-pch -Xclang /abs/path/cmake_pch.hxx.pch -Xclang -include -Xclang /abs/path/cmake_pch.hxx ... Both paths needs to be converted to relative path if CCACHE_BASEDIR is set for better cache hit rate in some CI systems.
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