[-] gcc-5 pcakge from .travis.yml

.travis.yml

@@ -9,7 +9,6 @@ before_install:
     - git submodule update --recursive
 
 script:
-    - export CC=gcc-5
     - mkdir build
     - cd build 
     - cmake -DBUILD_DAP_CORE_SERVER_TESTS=ON ../
@@ -21,6 +20,5 @@ addons:
     sources:
     - ubuntu-toolchain-r-test
     packages:
-    - gcc-5
     - libev-dev