[GHC] #10238: Update libffi shortly before first GHC 7.12.1 RC

[GHC]

#10238: Update libffi shortly before first GHC 7.12.1 RC
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        Reporter:  hvr               |                   Owner:  hvr
            Type:  task              |                  Status:  new
        Priority:  highest           |               Milestone:  8.0.1
       Component:  Runtime System    |                 Version:
      Resolution:                    |                Keywords:  libffi
Operating System:  Unknown/Multiple  |            Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by crb002):

 Anyway you could piggyback static libffi support on this? Not all
 environments have shared libraries.
 https://github.com/commercialhaskell/stack/issues/1032

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10238#comment:2>
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