Generally switching to haskell-vector-0.9.

The price is that gamma's current upper bound has to be patched.

svn path=/nixpkgs/trunk/; revision=30066

pkgs/development/libraries/haskell/gamma/default.nix

@@ -5,6 +5,9 @@ cabal.mkDerivation (self: {
   version = "0.7.0.1";
   sha256 = "0728b5mrzmj9hkaqvikl45jyi2p9hnkl2p6l9yv7wnw557yb0gb2";
   buildDepends = [ continuedFractions converge vector ];
+  preConfigure = ''
+    sed -i 's|\(vector.*\) && < 0.8|\1|' ${self.pname}.cabal
+  '';
   meta = {
     homepage = "https://github.com/mokus0/gamma";
     description = "Gamma function and related functions";