[build] Added Qt 4 build for Travis CI

.travis.yml

@@ -15,6 +15,11 @@ addons_shortcuts:
       sources: [ 'ubuntu-toolchain-r-test' ]
       packages: [ 'gdb', 'g++-4.9', 'gcc-4.9', 'libllvm3.4', 'xutils-dev',
                   'libxxf86vm-dev', 'x11proto-xf86vidmode-dev', 'mesa-utils' ]
+  addons_qt4: &qt4
+    apt:
+      sources: [ 'ubuntu-toolchain-r-test', 'ubuntu-sdk-team' ]
+      packages: [ 'gdb', 'g++-4.9', 'gcc-4.9', 'libllvm3.4', 'xutils-dev',
+                  'libxxf86vm-dev', 'x11proto-xf86vidmode-dev', 'mesa-utils', 'qt4-default' ]
 
 env:
   global:
@@ -81,6 +86,14 @@ matrix:
       env: BUILDTYPE=Release _CXX=clang++-3.5 _CC=clang-3.5
       addons: *clang35
 
+    # Qt 4 - Release
+    - language: cpp
+      compiler: ": linux-gcc49-release"
+      env: FLAVOR=qt4 BUILDTYPE=Release _CXX=g++-4.9 _CC=gcc-4.9
+      addons: *qt4
+      script:
+        - make test-qt
+
 cache:
   directories:
     - $HOME/.ccache