dev-vcs/darcs: added missing utf8-string depend (by tman)

Gentoo-bug: https://bugs.gentoo.org/516928
Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/lhs2tex: avoid Setup.hs collision with regex-compat-tdfa

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/wxhaskell: workaround GHC bug https://ghc.haskell.org/trac/ghc/ticket/9303

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>