haskell-hpack: new versions need latest HUnit to compile their test suite

Changed files
+6
pkgs
development
haskell-modules
+6
pkgs/development/haskell-modules/configuration-common.nix
···
libraryToolDepends = drv.libraryToolDepends or [] ++ [pkgs.postgresql];
testToolDepends = drv.testToolDepends or [] ++ [pkgs.procps];
});
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# Newer hpack's needs newer HUnit, but we cannot easily override the version
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# used in the build, so we take the easy way out and disable the test suite.
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hpack_0_20_0 = dontCheck super.hpack_0_20_0;
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hpack_0_21_0 = dontCheck super.hpack_0_21_0;
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