[commit: ghc] wip/merge-queue: Update `Cabal` submodule (ffca99b)

[git at git.haskell.org]

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

On branch  : wip/merge-queue
Link       : http://ghc.haskell.org/trac/ghc/changeset/ffca99b91058f62ccee1a89d822dac91bf74ee0d/ghc

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

commit ffca99b91058f62ccee1a89d822dac91bf74ee0d
Author: Herbert Valerio Riedel <hvr at gnu.org>
Date:   Mon Jan 7 00:59:23 2019 +0100

    Update `Cabal` submodule
    
    This also requires adapting `ghc-pkg` to use the new Cabal parsing API
    as the old ReadP-based one has finally been evicted for good.
    
    Hadrian bit finished by: Ben Gamari <ben at smart-cactus.org>


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

ffca99b91058f62ccee1a89d822dac91bf74ee0d
 ghc.mk                                |   3 -
 hadrian/src/Rules/Register.hs         |  16 ++-
 libraries/Cabal                       |   2 +-
 testsuite/tests/cabal/ghcpkg01.stdout | 246 ++++++++++++++++------------------
 testsuite/tests/cabal/ghcpkg07.stdout |  13 +-
 utils/ghc-cabal/ghc.mk                |  10 +-
 utils/ghc-pkg/Main.hs                 |  51 +++----
 7 files changed, 159 insertions(+), 182 deletions(-)

Diff suppressed because of size. To see it, use:

    git diff-tree --root --patch-with-stat --no-color --find-copies-harder --ignore-space-at-eol --cc ffca99b91058f62ccee1a89d822dac91bf74ee0d