Travis: Remove use of sudo to enable use container-based builds

.travis-deps.sh

@@ -5,24 +5,24 @@ set -x
 
 #if OS is linux or is not set
 if [ "$TRAVIS_OS_NAME" = "linux" -o -z "$TRAVIS_OS_NAME" ]; then
-    sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
-    sudo apt-get -qq update
-    sudo apt-get -qq install g++-4.9 xorg-dev libglu1-mesa-dev libxcursor-dev
-    sudo update-alternatives --install /usr/bin/g++ g++ /usr/bin/g++-4.9 90
+    export CC=gcc-4.9
+    export CXX=g++-4.9
+
+    mkdir -p $HOME/.local
     (
         git clone https://github.com/glfw/glfw.git --branch 3.0.4 --depth 1
         mkdir glfw/build && cd glfw/build
         cmake -DBUILD_SHARED_LIBS=ON \
               -DGLFW_BUILD_EXAMPLES=OFF \
               -DGLFW_BUILD_TESTS=OFF \
+              -DCMAKE_INSTALL_PREFIX=$HOME/.local \
               ..
-        make -j4 && sudo make install
+        make -j4 && make install
     )
 
-    sudo apt-get install lib32stdc++6
-    sudo mkdir -p /usr/local
     curl http://www.cmake.org/files/v2.8/cmake-2.8.11-Linux-i386.tar.gz \
-        | sudo tar -xz -C /usr/local --strip-components=1
+        | tar -xz -C $HOME/.local --strip-components=1
+
 elif [ "$TRAVIS_OS_NAME" = "osx" ]; then
     brew tap homebrew/versions
     brew install qt5 glfw3 pkgconfig