travis: Test global packages.

.travis.yml

@@ -24,19 +24,15 @@ matrix:
         - make
       env: CROSS_COMPILE=x86_64-w64-mingw32- CFLAGS="-D_WIN32_WINNT=0x0501"
     - compiler: gcc
-      addons:
-        # Install a more recent gcc than the default
-        apt:
-          packages:
-            - g++-7
-          sources:
-            - ubuntu-toolchain-r-test
+      # Install a more recent gcc than the default
+      before_install:
+        - sudo apt-get install -y g++-7
     - compiler: clang
+      # Install a more recent clang than the default
+      before_install:
+        - sudo apt-get install -y clang-3.8
       addons:
-        # Install a more recent clang than the default
         apt:
-          packages:
-            - clang-3.8
           sources:
             - ubuntu-toolchain-r-test
             - llvm-toolchain-precise-3.8
@@ -70,21 +66,15 @@ env:
 addons:
   apt:
     packages:
-      - curl
-      - pkg-config
-      - libglu1-mesa-dev
-      - freeglut3-dev
-      - mesa-common-dev
       - libsdl1.2-dev
       - libsdl-image1.2-dev
       - libsdl-mixer1.2-dev
       - libsdl-ttf2.0-dev
       - libusb-1.0-0-dev
-      - qt5-default
-      - qt5-qmake
-      - qtbase5-dev-tools
       - qtbase5-dev
       - qtdeclarative5-dev
+    sources:
+      - ubuntu-toolchain-r-test
   coverity_scan:
     project:
       name: "RetroArch"