[commit: ghc] wip/nfs-locking: Install alex and happy using cabal to fix Travis failure (67e3104)

[git at git.haskell.org]

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

On branch  : wip/nfs-locking
Link       : http://ghc.haskell.org/trac/ghc/changeset/67e31045fb749fdcb4cb67248931e5ce403e012b/ghc

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

commit 67e31045fb749fdcb4cb67248931e5ce403e012b
Author: Andrey Mokhov <andrey.mokhov at gmail.com>
Date:   Mon Apr 11 00:43:59 2016 +0100

    Install alex and happy using cabal to fix Travis failure


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

67e31045fb749fdcb4cb67248931e5ce403e012b
 .travis.yml | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/.travis.yml b/.travis.yml
index 9547914..21bf769 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -8,8 +8,6 @@ matrix:
               apt:
                   packages:
                       - ghc-7.10.3
-                      - alex-3.1.4
-                      - happy-1.19.5
                       - cabal-install-1.22
                       - zlib1g-dev
                   sources: hvr-ghc
@@ -19,6 +17,7 @@ matrix:
               - PATH="$HOME/.cabal/bin:$PATH"
               - export PATH
               - cabal update
+              - cabal install alex happy
 
         - os: osx
           env: TARGET=utils/ghc-pkg/stage1/build/tmp/ghc-pkg