Update Cabal submodule, Fixes #11326

Troublesome commit in Cabal was reverted.

Update Cabal submodule, Fixes #11326
Troublesome commit in Cabal was reverted.
ab0d733d · Alan Zimmerman · b469b308 · bf4d05ef · 072e4728 · bf4d05ef
Commit ab0d733d authored Jan 01, 2016 by Alan Zimmerman
--- a/Cabal @ bf4d05ef
+++ b/Cabal @ bf4d05ef
-Subproject commit 072e4728079e6caf521339e3934e1279aa09e83d
+Subproject commit bf4d05efa79a41a819e3d9278d5e9e1e5a055ce7