[commit: ghc] ghc-8.6: Bump unix submodule (fd7cedc)

[git at git.haskell.org]

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

On branch  : ghc-8.6
Link       : http://ghc.haskell.org/trac/ghc/changeset/fd7cedc8b28b4e35000dbad7d86c1d79fe127437/ghc

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

commit fd7cedc8b28b4e35000dbad7d86c1d79fe127437
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Thu Aug 9 11:28:04 2018 -0400

    Bump unix submodule


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

fd7cedc8b28b4e35000dbad7d86c1d79fe127437
 libraries/unix | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/unix b/libraries/unix
index ee3e99a..f4f500d 160000
--- a/libraries/unix
+++ b/libraries/unix
@@ -1 +1 @@
-Subproject commit ee3e99a0d8a75edc90a1a4e9fb1c593a99a02bb9
+Subproject commit f4f500d53b4c73e542a377a5c675309dbbe5774d