opencv: Enable fewer dependencies by default

In particular, this prevents KDE from pulling in gfortran, numpy and
atlas. We don't want anything important depending on atlas because it
has a crazy non-deterministic build system.

http://hydra.nixos.org/build/12555947
gcc: Fix multilib builds

http://hydra.nixos.org/build/12578050
emacs: Remove 23.x
emacs24Macport: Mark as lowPrio
llvm: Removed unused versions 3.1 and 3.2
Re-generate Haskell packages with cabal2nix.
haskell-stylish-haskell: update to version 0.5.10.1
haskell-parsers: switch to version 0.12
haskell-HUnit-approx: add version 1.0
haskell-github-backup: update to version 1.20140721
haskell-ChasingBottoms: update to version 1.3.0.8
haskell-MFlow: update to version 0.4.5.5
haskell-cgrep: update to version 6.4.4
haskell-cmdargs: update to version 0.10.8
haskell-ekg-carbon: update to version 1.0.1
haskell-focus: update to version 0.1.2
haskell-gdiff: update to version 1.1
haskell-generic-aeson: update to version 0.1.1.1
haskell-haskell-token-utils: update to version 0.0.0.4
haskell-hcltest: update to version 0.3.3