[GHC] #12572: `readdir_r` is deprecated

[GHC]

#12572: `readdir_r` is deprecated
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        Reporter:  erikd             |                Owner:  erikd
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Core Libraries    |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Building GHC      |  Unknown/Multiple
  failed                             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Edward Z. Yang <ezyang@…>):

 In [changeset:"a8238a4eb628dcab93e19021b27c0cf2b38ef7d0/ghc"
 a8238a4e/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="a8238a4eb628dcab93e19021b27c0cf2b38ef7d0"
 Update unix submodule to latest HEAD.

 Fixes readdir validation error (fixes #12572).

 Signed-off-by: Edward Z. Yang <ezyang at cs.stanford.edu>
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12572#comment:8>
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