Autogen: Add moc path prefix generation (AUTOMOC_PATH_PREFIX)
The new `AUTOMOC_PATH_PREFIX` boolean target property enables automatic generation of the path prefix `-p` option for `moc`. `AUTOMOC_PATH_PREFIX` is initialized from the variable `CMAKE_AUTOMOC_PATH_PREFIX`, which is ON by default. When `AUTOMOC_PATH_PREFIX` is enabled, CMake tests if a `moc`ed header file is in one of the include directories. If so, then the `-p` option, with the relative path of the header parent directory to the respective include directory, is added to the `moc` command. If the header file is not in an include directory, the `-p` option is omitted. Closes: #18815 "AUTOMOC: generated files include full relative path, breaking certain reproducible builds"
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