[CI] Remove gcc/g++ related pkgs & vars which are useless now.

Author: PeterDaveHello

.travis.yml

@@ -8,8 +8,6 @@ addons:
       - llvm-toolchain-precise
       - llvm-toolchain-precise-3.8
     packages:
-      - gcc-4.8
-      - g++-4.8
       - clang-3.8
       - stack
       - bc
@@ -34,8 +32,6 @@ script:
   - if [ -z "${SHELLCHECK-}" ]; then make TEST_SUITE=$TEST_SUITE URCHIN=/tmp/urchin/package/urchin test-$SHELL ; fi
 env:
   global:
-    - CXX=g++-4.8
-    - CC=gcc-4.8
     - PATH=$(echo $PATH | sed 's/::/:/')
     - NVM_DIR="${TRAVIS_BUILD_DIR}"
   matrix: