[commit: ghc] master: Sync up haskeline submodule to 0.7.4.0 release tag (a1ffd70)

[git at git.haskell.org]

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

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/a1ffd70835fba3aeb5be5c5d526e068cafe277be/ghc

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

commit a1ffd70835fba3aeb5be5c5d526e068cafe277be
Author: Herbert Valerio Riedel <hvr at gnu.org>
Date:   Fri Apr 21 01:44:03 2017 +0200

    Sync up haskeline submodule to 0.7.4.0 release tag


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a1ffd70835fba3aeb5be5c5d526e068cafe277be
 libraries/haskeline | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/haskeline b/libraries/haskeline
index 91f6afd..d5ef581 160000
--- a/libraries/haskeline
+++ b/libraries/haskeline
@@ -1 +1 @@
-Subproject commit 91f6afd971fde46423237bfa5215e95365017f99
+Subproject commit d5ef581a19218b96946921c5f092bafe1739e30b