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automoc: silence linker warning on macos

Tim Blechmann requested to merge timblechmann/cmake:feature/silence-ranlib-warning into master

when an empty mocs_compilation.cpp is included in a static library, the macos linker emits a warning:

/Applications/Xcode13.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin/ranlib:
file: path/To/Library.a(mocs_compilation.cpp.o) has no symbols

we therefore generate a globally visible function and hope that no application uses the same function name.

Fixes: #23551
Topic-rename: automoc-silence-ranlib-warning

Edited by Brad King

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