Update .travis.yml

.travis.yml

@@ -16,11 +16,14 @@ cache:
   apt: true 
   ccache: true
   
+
 before_install:
+  - if [ "$CXX" == "g++" ]; then export CXX=""; fi
+  - if [ "$CC" == "gcc" ];  then export CXX=""; fi
+  
   - echo $LANG
   - echo $LC_ALL
 
-  
   # update repository status (-qq is more quiet)
   - sudo apt-get update -qq
   - sudo apt-get install -y  coreutils gawk mawk original-awk