dev-haskell/happy: add a safety check around circular depend

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/alex: add a safety check around circular depend

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
sync changes from portage, and loosen pandoc-types dep in citeproc-hs
Bump pandoc-types to 1.12.1.2