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file: Normalize GENERATE command input and output file paths

Brad King requested to merge brad.king/cmake:file-generate-path-cleanup into master

Normalize absolute paths so that no extra components like ../ or ...//... appear that later confuse relative path computation. In particular, we expect paths sent to AddCMakeDependFile and AddCMakeOutputFile to be normalized.

Do this only for paths that are already absolute because we can't handle relative paths yet (see #16786 (closed)).

Fixes: #16892 (closed)

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