.travis.yml: rework binutils package update

.travis.yml

@@ -51,13 +51,6 @@ before_install:
       brew update; brew update;
       brew install ccache glew llvm40;
     fi;
-  # We need to update binutils to a newer version to link against the ffmpeg libs on.
-  - if [ "$TRAVIS_OS_NAME" = "linux" ]; then
-      sudo add-apt-repository ppa:jonathonf/binutils -y ;
-      sudo apt-get update ; 
-      sudo apt-get install binutils -y;
-      ld --version ;
-    fi;
 
 before_script:
   - git submodule update --init asmjit 3rdparty/ffmpeg 3rdparty/pugixml 3rdparty/GSL 3rdparty/libpng Utilities/yaml-cpp 3rdparty/cereal 3rdparty/hidapi Vulkan/glslang Vulkan/Vulkan-LoaderAndValidationLayers
@@ -104,7 +97,9 @@ addons:
     sources:
       - ubuntu-toolchain-r-test
       - llvm-toolchain-trusty-4.0
+      - sourceline: 'ppa:jonathonf/binutils' # We need to update binutils to a newer version to link against the ffmpeg libs on.
     packages:
+      - binutils
       - cmake
       - libasound2-dev
       - libopenal-dev