dev-haskell/cabal-macosx: new package (for reactive-banana-wx)

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/wxhaskell: bump up to 0.90.0.1

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/reactive-banana-wx: new package (request by romildo and hkBst).

Signed-off-by: Sergei Trofimovich <slyfox@gentoo.org>
dev-haskell/reactive-banana-wx: fix fo USE=buildexamples

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