git-authenticate: Keep a local cache of previously-authenticated commits.

A list of already-authenticated commits is kept in
~/.cache/guix/authentication.  This speeds up subsequent "make
authenticate" invocations.

* build-aux/git-authenticate.scm (authenticated-commit-cache-file)
(previously-authenticated-commits, cache-authenticated-commit): New
procedures.
(git-authenticate): Define 'authenticated-commits' and pass it as a
third argument to 'commit-difference'.  Add call to
'cache-authenticated-commit'.  Don't display signing stats when STATS is
null.

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