Script to generate signatures on the various PuTTY build outputs.

Saves me having to remember all the fiddly gpg arguments every time.
Should be usable for both releases (with manual passphrase input)
and snapshots (run automatically).

git-svn-id: svn://svn.tartarus.org/sgt/putty@7227 cda61777-01e9-0310-a592-d414129be87e