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>