[commit: ghc] master: Update Cabal submodule to 1.22 branch tip (c4aa959)

[git at git.haskell.org]

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

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/c4aa959bd771f7e69c7f0da1e857599f513d5331/ghc

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

commit c4aa959bd771f7e69c7f0da1e857599f513d5331
Author: Herbert Valerio Riedel <hvr at gnu.org>
Date:   Thu Mar 19 17:41:48 2015 +0100

    Update Cabal submodule to 1.22 branch tip


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c4aa959bd771f7e69c7f0da1e857599f513d5331
 libraries/Cabal | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/Cabal b/libraries/Cabal
index cbd9d53..b7b98fc 160000
--- a/libraries/Cabal
+++ b/libraries/Cabal
@@ -1 +1 @@
-Subproject commit cbd9d53bc028717323417316a5ed10d65c704d87
+Subproject commit b7b98fc4a1603eec5af7efcab13afadee1da6c3a