Add a bunch of Debian build rules.
Fix up the copyright file.
Point to miekgs github repository instead of mine.
Add a patch for fixing that typo.
Fill in the ITP number.
Vcs-{Git,Browser} tags are supposed to point to the _packaging_, not
the upstream git.
There is nothing architecture specific in the dev package since we
don't build the library, we just put the source into the right place…
Remove the golang-dns-bin package; we'd have to provide manpages,
which would be pretty useless for a bunch of example programs nobody
is ever going to use.