[GHC] #8701: Update libffi-tarballs to latest libffi

[GHC]

#8701: Update libffi-tarballs to latest libffi
-------------------------------------+-------------------------------------
              Reporter:  lukexi      |            Owner:
                  Type:  bug         |           Status:  closed
              Priority:  high        |        Milestone:  7.8.1
             Component:  Compiler    |          Version:  7.8.1-rc1
  (FFI)                              |         Keywords:
            Resolution:  invalid     |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Easy (less than 1
  Unknown/Multiple                   |  hour)
       Type of failure:  Building    |       Blocked By:
  GHC failed                         |  Related Tickets:
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by angerman):

 According to the History at https://github.com/atgreen/libffi AArch64
 (ARM) support was added in libffi 3.1


 {{{
 3.1 May-19-14
         Add AArch64 (ARM64) iOS support.
         Add Nios II support.
         Add m88k and DEC VAX support.
         Add support for stdcall, thiscall, and fastcall on non-Windows
           32-bit x86 targets such as Linux.
         Various Android, MIPS N32, x86, FreeBSD and UltraSPARC IIi
           fixes.
         Make the testsuite more robust: eliminate several spurious
           failures, and respect the $CC and $CXX environment variables.
         Archive off the manually maintained ChangeLog in favor of git
           log.
 }}}

 The original libffi patch that is part of the libffi-3.0.14.tar.gz as
 mentioned above
 ended up in two pull requests:

 - https://github.com/atgreen/libffi/pull/19
 - https://github.com/atgreen/libffi/pull/60

 of which non was finally merged.  Both seem dead by now, but as mentioned
 above in libffi 3.1, iOS support was added.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8701#comment:3>
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