haskell-transformers-compat: drop obsolete override for ghc-8.0.x

Changed files
-3
pkgs
development
haskell-modules
-3
pkgs/development/haskell-modules/configuration-ghc-8.0.x.nix
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# Older versions of QuickCheck don't support our version of Template Haskell.
QuickCheck = self.QuickCheck_2_8_2;
-
# Older versions don't support our version of transformers.
-
transformers-compat = self.transformers-compat_0_5_1_4;
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# https://github.com/hspec/HUnit/issues/7
HUnit = dontCheck super.HUnit;