[commit: ghc] master: Update unix submodule to v2.7.2.0 release (81b14c1)

[git at git.haskell.org]

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

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/81b14c141dc385dbb0de00ea72217185cfa22a09/ghc

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commit 81b14c141dc385dbb0de00ea72217185cfa22a09
Author: Herbert Valerio Riedel <hvr at gnu.org>
Date:   Tue Apr 19 23:40:52 2016 +0200

    Update unix submodule to v2.7.2.0 release


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81b14c141dc385dbb0de00ea72217185cfa22a09
 libraries/unix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/unix b/libraries/unix
index 861ad25..5b2e91a 160000
--- a/libraries/unix
+++ b/libraries/unix
@@ -1 +1 @@
-Subproject commit 861ad256e0a5337a1a685b1cd50ae91ee9374cab
+Subproject commit 5b2e91a09190f1686ea195d25183abda1757d771