Remove unnecessary package installs

Author: isuruf

.travis.yml

@@ -53,15 +53,6 @@ matrix:
     - env: BUILD_TYPE="Debug" WITH_BFD="yes" PYTHON_VERSION="3.5" BUILD_SHARED_LIBS="yes"
       compiler: clang
       os: linux
-      addons:
-        apt:
-          sources:
-          - ubuntu-toolchain-r-test
-          - llvm-toolchain-trusty-8
-          packages:
-          - clang
-          - libstdc++-4.8-dev
-          - binutils-dev
     - env: BUILD_TYPE="Release" PYTHON_VERSION="2.7" WITH_NUMPY="no"
       compiler: clang
       os: linux
@@ -78,7 +69,7 @@ matrix:
           - libstdc++-4.8-dev
           - binutils-dev
           - llvm-8-dev
-    - env: BUILD_TYPE="Debug" PYTHON_VERSION="2.7" WITH_LLVM="5.0" WITH_SCIPY="yes" 
+    - env: BUILD_TYPE="Debug" PYTHON_VERSION="2.7" WITH_LLVM="5.0" WITH_SCIPY="yes"
       compiler: clang
       os: osx
     - env: BUILD_TYPE="Release" PYTHON_VERSION="3.5" WITH_NUMPY="no"