unifdef: Handle redefined symbols correctly.MFC after: 1 weekSponsored by: Klara, Inc.Reviewed by: kevansDifferential Revision: https://reviews.freebsd.org/D41758
unifdef: Reapply our 7102ec5226e5.
unifdef: Reapply our 61287be18189.
Add 'contrib/unifdef/' from commit '0da44885831dc0a43c4ca6ff04a2430993cc0a80'git-subtree-dir: contrib/unifdefgit-subtree-mainline: 3b7ffacdee49f90716cba2bcf8af3fc1971ae031git-subtree-split: 0da44
Add 'contrib/unifdef/' from commit '0da44885831dc0a43c4ca6ff04a2430993cc0a80'git-subtree-dir: contrib/unifdefgit-subtree-mainline: 3b7ffacdee49f90716cba2bcf8af3fc1971ae031git-subtree-split: 0da44885831dc0a43c4ca6ff04a2430993cc0a80
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