haskell-void: trigger re-build to unbreak our copy on Hydra

Changed files
+4
pkgs
development
haskell-modules
+4
pkgs/development/haskell-modules/configuration-ghc-7.8.x.nix
···
# needs mtl-compat to build with mtl 2.1.x
cgi = addBuildDepend super.cgi self.mtl-compat;
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# Ugly hack that triggers a re-build to get rid of the broken version served
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# by Hydra: http://hydra.cryp.to/build/794273/nixlog/98/raw.
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void = appendConfigureFlag super.void "-fignore-me";
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}