[GHC] #10238: Update libffi shortly before first GHC 8.0.1 RC

[GHC]

#10238: Update libffi shortly before first GHC 8.0.1 RC
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        Reporter:  hvr               |                Owner:  hvr
            Type:  task              |               Status:  patch
        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 Rev(s):  Phab:D1589
       Wiki Page:                    |
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Comment (by Herbert Valerio Riedel <hvr@…>):

 In [changeset:"7a40a6cde92896d7de09919499c66324a2d01771/ghc"
 7a40a6cd/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="7a40a6cde92896d7de09919499c66324a2d01771"
 Update libffi-tarballs submodule to libffi 3.1 (re #10238)

 Reviewers: bgamari, austin

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D1589

 GHC Trac Issues: #10238
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10238#comment:5>
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