[commit: ghc] master: Update unix submodule to latest snapshot (ddd38e7)

[git at git.haskell.org]

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

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/ddd38e7dce5d841b89479a4496b117553f0feeec/ghc

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

commit ddd38e7dce5d841b89479a4496b117553f0feeec
Author: Herbert Valerio Riedel <hvr at gnu.org>
Date:   Mon Feb 1 19:38:46 2016 +0100

    Update unix submodule to latest snapshot
    
    Besides containing more internal refactorings,
    this update also bumps unix's version number to 2.7.2.0


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

ddd38e7dce5d841b89479a4496b117553f0feeec
 libraries/unix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/unix b/libraries/unix
index 91b8238..ff1c16d 160000
--- a/libraries/unix
+++ b/libraries/unix
@@ -1 +1 @@
-Subproject commit 91b82383873b46385d239f2b059f353b11f07e0f
+Subproject commit ff1c16d4ee0c4ca043bd99a5d6741ea2d53e7000