haskell-defaults.nix: explicitly set mtl version in Haskell Platform 2009.2.0.2 to fix builds with GHC 6.10.4
haskell-defaults.nix: explicitly set mtl version in Haskell Platform 2009.2.0.2 to fix builds with GHC 6.10.4

svn path=/nixpkgs/trunk/; revision=34458

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