haskell-ghc-heap-view: update to version 0.5
haskell-http-reverse-proxy: update to version 0.1.1.5
haskell-mainland-pretty: update to version 0.2.6
haskell-shakespeare-js: update to version 1.1.4
haskell-shakespeare: update to version 1.0.5
ghc: bump HEAD compiler to version 7.7
pkgs/top-level/release-haskell.nix: enable some ghc 7.7 builds
ghc-head: fix build
pkgs/build-support/cabal: disable split-objects for GHC 7.7 builds to work around broken compiler
idris: drop obsolete package, it doesn't compile anywhere