[commit: ghc] wip/fix-docs: Bump Cabal submodule (c1a596b)

[git at git.haskell.org]

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

On branch  : wip/fix-docs
Link       : http://ghc.haskell.org/trac/ghc/changeset/c1a596b238a205039027c15d173ac9037cd16235/ghc

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commit c1a596b238a205039027c15d173ac9037cd16235
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Fri Aug 3 16:33:13 2018 -0400

    Bump Cabal submodule


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c1a596b238a205039027c15d173ac9037cd16235
 libraries/Cabal | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/Cabal b/libraries/Cabal
index 8828258..6671506 160000
--- a/libraries/Cabal
+++ b/libraries/Cabal
@@ -1 +1 @@
-Subproject commit 8828258813f726150cd748433a8ad0df3310c6bc
+Subproject commit 6671506b488a0fe2079f9059a23510b35514c031