Resign tarball for disorderfs-0.5.9.

The release process was interrupted or restarted on my local machine, so a
bunch of things were slightly botched in this release.

This now validates for me:

    $ gpg --verify disorderfs-0.5.9.tar.gz.asc disorderfs-0.5.9.tar.gz

    gpg: Signature made Mon 20 Apr 2020 10:38:33 BST
    gpg:                using RSA key C2FE4BD271C139B86C533E461E953E27D4311E58
    gpg: Good signature from "Chris Lamb <chris@chris-lamb.co.uk>" [unknown]
    gpg:                 aka "Chris Lamb <lamby@gnu.org>" [unknown]
    gpg:                 aka "Chris Lamb <lamby@debian.org>" [unknown]
    Primary key fingerprint: C2FE 4BD2 71C1 39B8 6C53  3E46 1E95 3E27 D431 1E58