Properly package universal-ctags

We need this to properly deploy the python3-swh.indexer (since it's a runtime dependeny).

Does not exist in debian yet.

Package it properly for us.

And then if possible, push it to debian (optional).

Discussion: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=797359 https://github.com/universal-ctags/ctags/issues/655#issuecomment-255708761

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Migrated from T594 (view on Phabricator)