[arch-general] GHC 7.6.1 now in [extra]

Hey everyone! It's that time again for arch to get the latest ghc! GHC 7.6.1 comes with a bunch of new and exciting features: http://www.haskell.org/ghc/docs/7.6.1/html/users_guide/release-7-6-1.html It took just over a month to do the full rebuild because of the amount of patching and coordination with upstream we had to do. I would like to thank everyone who worked on this rebuild! Cheers!