Bug#797283: rss2irc: build-depends unsatisfiable in sid and stretch

[Peter Green]

package: rss2irc
version: 1.0.6-3
severity: serious
tags: sid stretch

according to 
https://buildd.debian.org/status/package.php?p=rss2irc&suite=unstable

rss2irc build-depends on missing:
- amd64:libghc-irc-dev (< 0.6)

packages.debian.org confirms that the version of libghc-irc-dev in sid 
and stretch is 0.6.2.0-2+b<something> where <something> varies by 
architecture.