Fix build of torify.1

The build was broken by changes in f8c45339f72525c68, but we didn't
notice, since that commit also made torify.1 only get built when
tor-fw-helper was turned on.

Fixes bug 11321; bugfix on Tor 0.2.5.1-alpha.
Make dump_desc() use binary mode

Otherwise, it could mung the thing that came over the net on windows,
which would defeat the purpose of recording the unparseable thing.

Fixes bug 11342; bugfix on 0.2.2.1-alpha.
Merge remote-tracking branch 'public/bug11342'
Merge remote-tracking branch 'public/build_torrify_manpage_again'