packaging: fix path where .deb files are looked for
In builddeb script, the path where .deb files are looked for should
simply be $OUTPUTDIR since the previous instruction moves those files
there.
This fixes "make deb".
packaging: let Debian package depends on sensible-utils
This fixes the following Lintian error:
E: mercurial-common: missing-depends-on-sensible-utils etc/mercurial/hgrc.d/default-tools.rc