[commit: unix] ghc-7.4's head updated: Roll back the sigset capi changes (77927c8)

[Ian Lynagh]

Repository : ssh://darcs.haskell.org//srv/darcs/packages/unix

Branch 'ghc-7.4' now includes:

     e33f501... Convert come FFI bindings to use the capi calling convention
     a55cb03... Use capi some more (part of #5480)
     b02e926... Use capi to define the fcntl FFI imports
     77927c8... Roll back the sigset capi changes