dev-haskell/cabal-install: remove unused patch(es)

Signed-off-by: Michael Mair-Keimberger <mmk@levelnine.at>
Signed-off-by: Ulrich Müller <ulm@gentoo.org>

dev-haskell/cabal-install/files/cabal-install-0.13.3-nopref.patch

@@ -1,20 +0,0 @@
-diff --git a/Distribution/Client/IndexUtils.hs b/Distribution/Client/IndexUtils.hs
-index 48d8d49..3a38ee1 100644
---- a/Distribution/Client/IndexUtils.hs
-+++ b/Distribution/Client/IndexUtils.hs
-@@ -312,10 +312,15 @@ extractPkg entry = case Tar.entryContent entry of
- 
- extractPrefs :: Tar.Entry -> Maybe [Dependency]
- extractPrefs entry = case Tar.entryContent entry of
-+{-
-+ -- get rid of hackage's preferred-versions
-+ -- I'd like to have bleeding-edge packages in system and I don't fear of
-+ -- broken packages with improper depends
-   Tar.NormalFile content _
-      | takeFileName (Tar.entryPath entry) == "preferred-versions"
-     -> Just . parsePreferredVersions
-      . BS.Char8.unpack $ content
-+-}
-   _ -> Nothing
- 
- parsePreferredVersions :: String -> [Dependency]