[commit: ghc] ghc-8.6: Bump Cabal submodule to 2.4.0.0 (3b998a9)

[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/3b998a9321e37f9484c0b6e02b1fbf609ff2ab94/ghc

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

commit 3b998a9321e37f9484c0b6e02b1fbf609ff2ab94
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Fri Sep 7 07:14:43 2018 -0400

    Bump Cabal submodule to 2.4.0.0


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

3b998a9321e37f9484c0b6e02b1fbf609ff2ab94
 libraries/Cabal | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libraries/Cabal b/libraries/Cabal
index fe10982..b00d215 160000
--- a/libraries/Cabal
+++ b/libraries/Cabal
@@ -1 +1 @@
-Subproject commit fe10982db1f2fa7d828fc5f8ddaa5beedceaddec
+Subproject commit b00d2150b3f2d216aa7458606c9c018f9beb75a2