We do need editline dependencies

For GHC 6.10.x we've switched to bundling readline instead of editline. Most
packages probably don't depend on editline, but as it is part of the haskell
platform 2009.0.0 we at least need the ebuild.

Cabal2Ebuild.hs

@@ -179,7 +179,7 @@ coreLibs = map Cabal.PackageName
 --,"bytestring"   --already has ebuild
   ,"containers"
   ,"directory"
-  ,"editline"
+  --,"editline"
 --,"filepath"     --already has ebuild
   ,"ghc"
   ,"ghc-prim"