I've changed my mind about the PuTTY build script. It now delivers

I've changed my mind about the PuTTY build script. It now delivers
the release directory into a _subdirectory_ of the main build.out,
and delivers the link maps and sign.sh alongside it. That simplifies
both the nightly snapshot cron job (which now doesn't have to
carefully move the maps out of the release directory or go looking
in strange places for sign.sh) and my release procedure (for much
the same reasons).

git-svn-id: svn://svn.tartarus.org/sgt/putty@7258 cda61777-01e9-0310-a592-d414129be87e