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clang-tidy: Don't append compiler commands if using -p

Craig Scott requested to merge craig.scott/cmake:clang-tidy-prefer-p-option into master

When the -p option is given to clang-tidy, it doesn't need the compile command line to be appended. It can get everything it needs from the compile_commands.json file in the directory specified with the -p option. When the compiler being used is not the system default compiler, clang-tidy has been observed to pick up the wrong headers when the compiler command line is given, but not if only the -p option is used. Therefore, don't append the compiler command line if -p is present in the <LANG>_CLANG_TIDY target property.

Fixes: #24017 (closed)

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