Switch GHC 6.10.x to network 2.2.x because newer versions give buffer…

…ing errors (according to the Cabal file from HTTP, which excludes newer versions from building)

pkgs/top-level/haskell-defaults.nix

@@ -114,7 +114,7 @@
     hashtables = super.hashtables.override { cabal = self.cabal.override { Cabal = self.Cabal_1_16_0_3; }; };
     HTTP = super.HTTP.override { cabal = self.cabal.override { Cabal = self.Cabal_1_16_0_3; }; };
     HUnit = super.HUnit.override { cabal = self.cabal.override { Cabal = self.Cabal_1_16_0_3; }; };
-    network = super.network.override { cabal = self.cabal.override { Cabal = self.Cabal_1_16_0_3; }; };
+    network = super.network_2_2_1_7.override { cabal = self.cabal.override { Cabal = self.Cabal_1_16_0_3; }; };
     OpenGLRaw = self.OpenGLRaw_1_3_0_0;
     OpenGL = self.OpenGL_2_6_0_1;
     QuickCheck = super.QuickCheck.override { cabal = self.cabal.override { Cabal = self.Cabal_1_16_0_3; }; };