Update Cabal submodule to HEAD (1.21)

[Joachim Breitner]

Hi Edward,

your commit makes the builders fail:

[28 of 79] Compiling Distribution.Simple.Utils ( libraries/Cabal/Cabal/Distribution/Simple/Utils.hs, bootstrapping/Distribution/Simple/Utils.o )

libraries/Cabal/Cabal/Distribution/Simple/Utils.hs:382:46:
    `Process.delegate_ctlc' is not a (visible) constructor field name

libraries/Cabal/Cabal/Distribution/Simple/Utils.hs:408:46:
    `Process.delegate_ctlc' is not a (visible) constructor field name
make[1]: *** [utils/ghc-cabal/dist/build/tmp/ghc-cabal] Error 1
make: *** [all] Error 2

https://s3.amazonaws.com/archive.travis-ci.org/jobs/30289010/log.txt

Please fix!

Thanks,
Joachim

-- 
Joachim “nomeata” Breitner
  mail at joachim-breitner.de • http://www.joachim-breitner.de/
  Jabber: nomeata at joachim-breitner.de  • GPG-Key: 0xF0FBF51F
  Debian Developer: nomeata at debian.org

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