[commit: ghc] master: Update unix submodule to latest HEAD. (a8238a4)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/a8238a4eb628dcab93e19021b27c0cf2b38ef7d0/ghc

>---------------------------------------------------------------

commit a8238a4eb628dcab93e19021b27c0cf2b38ef7d0
Author: Edward Z. Yang <ezyang at cs.stanford.edu>
Date:   Thu Sep 8 12:05:30 2016 -0700

    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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a8238a4eb628dcab93e19021b27c0cf2b38ef7d0
 libraries/unix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/unix b/libraries/unix
index 40820da..7b20b4c 160000
--- a/libraries/unix
+++ b/libraries/unix
@@ -1 +1 @@
-Subproject commit 40820da5fb35c53aed53c211277c3e6077c1ddf9
+Subproject commit 7b20b4cbc35a2fea3f26c988f9b2a95640babaaa