[ITP, RFU] Unison: new, updated, and obsoleted packages

[Andrew Schulman]

> Just send new setup.hint files,
> I will move the packages in the _obsolete subdir then.

OK:

# unison2.9.1
wget http://home.comcast.net/~andrex/cygwin/unison2.9.1/setup.hint
# unison2.9.20
wget http://home.comcast.net/~andrex/cygwin/unison2.9.20/setup.hint
# unison2.10.2
wget http://home.comcast.net/~andrex/cygwin/unison2.10.2/setup.hint
# unison2.12.0
wget http://home.comcast.net/~andrex/cygwin/unison2.12.0/setup.hint

Thanks,
Andrew.