Update hash for fail2ban
mesa: fix the default DRI driver dir to /run/opegl-driver{,-32}
os-specific/darwin/setfile: drop the "unfree" license

Setfile is included by other derivation, which in turns makes them unfree, too.
This causes plenty of evaluation errors on Hydra, i.e.:

  at `haskellPackages_ghc763_profiling.wx.x86_64-darwin' [nixpkgs = ..., officialRelease = false]:
  user-thrown exception: package ‘setfile’ has an unfree license, refusing to evaluate

Now, it's true that "setfile" is unfree, but this doesn't affect us: our
derivation doesn't include the actual binary -- it just contains a symlink to
"/usr/bin/SetFile". Arguably, our setfile derivation is free and we can
re-distribute it.
tcpcrypt: patch tcpcryptd to run under uid 93 instead of 666
Update SWI-Prolog to version 6.4.1
Update YAP to version 6.2.2
Update YAP to version 6.2.2
happy: add version 1.18.11
haskell-vault: update to version 0.3.0.2
git-annex: update to version 4.20130909
Merge pull request #955 from DriesVanDaele/upstream

Update YAP to version 6.2.2
Merge pull request #954 from DriesVanDaele/master

Update SWI-Prolog to version 6.4.1
yap: add 'zlib' and 'gmp' build inputs to enable additional features
idris: re-generate with cabal2nix
haskell-acid-state: update to version 0.12.0
haskell-basic-prelude: update to version 0.3.6.0
haskell-diagrams: update to version 0.7.1.1
haskell-diagrams-lib: update to version 0.7.1
haskell-diagrams-svg: update to version 0.8.0.1
haskell-hspec: update to version 1.7.2.1