ghc 7.8.3
ghc: bump bundled Cabal version to 1.18.1.4

Otherwise, attempting to `brew install cabal-install` will still fail,
despite forcing cabal-install's bootstrap script to use Cabal 1.20.0.2
instead of Cabal 1.20.0.0.
ghc: update 7.8.3 bottle.

Closes #31664.
fswatch 1.4.3.1

Closes #32162.

Signed-off-by: Jack Nagel <jacknagel@gmail.com>
fswatch: update 1.4.3.1 bottle.
cabal-install: Anticipate and fix GHC 7.8 bug.
cabal-install: update 1.20.0.3_1 bottle.
fswatch: update 1.4.3.1 bottle.