Travis: Update config to reduce timeout errors.

Leverage homebrew/apt addons to install packages since they are documented
to automatically perform retries on failure.

This updates to Ubuntu Xenial and macOS Sierra, which are supported
versions.  This isn't to increase minimum requirements necessarily, but to
make sure Travis keeps running smoothly.

.travis.sh

@@ -18,53 +18,19 @@ download_extract_zip() {
     unzip $2 2>&1 | pv > /dev/null
 }
 
-brew_install() {
-    brew install $1
-    brew outdated $1 || brew upgrade $1
-}
-
 travis_before_install() {
     git submodule update --init --recursive
-
-    if [ "$TRAVIS_OS_NAME" = "linux" ]; then
-        sudo apt-get update -qq
-        sudo apt-get install software-properties-common aria2 pv build-essential libgl1-mesa-dev libglu1-mesa-dev -qq
-    elif [ "$TRAVIS_OS_NAME" = "osx" ]; then
-        brew update
-        brew_install ccache
-    fi
-}
-
-setup_ccache_script() {
-    if [ ! -e "$1" ]; then
-        mkdir "$1"
-    fi
-
-    echo "#!/bin/bash" > "$1/$3"
-    echo "ccache $2/$3 \$*" >> "$1/$3"
-    chmod +x "$1/$3"
 }
 
 travis_install() {
     # Ubuntu Linux + GCC 4.8
     if [ "$PPSSPP_BUILD_TYPE" = "Linux" ]; then
-        # For libsdl2-dev.
-        sudo add-apt-repository ppa:zoogie/sdl2-snapshots -y
         if [ "$CXX" = "g++" ]; then
-            sudo add-apt-repository ppa:ubuntu-toolchain-r/test -y
-        fi
-        if [ "$QT" = "TRUE" ]; then
-            sudo add-apt-repository --yes ppa:ubuntu-sdk-team/ppa
-        fi
-
-        sudo apt-get update
-        sudo apt-get install libsdl2-dev -qq
-        if [ "$CXX" = "g++" ]; then
-            sudo apt-get install g++-4.8 -qq
+            sudo apt-get install -qq g++-4.8
         fi
 
         if [ "$QT" = "TRUE" ]; then
-            sudo apt-get install -qq qt5-qmake qtmultimedia5-dev qtsystems5-dev qtbase5-dev qtdeclarative5-dev qttools5-dev-tools libqt5webkit5-dev libsqlite3-dev qt5-default
+            sudo apt-get install -qq qt5-qmake qtmultimedia5-dev qtsystems5-dev qtbase5-dev qtdeclarative5-dev qttools5-dev-tools libqt5webkit5-dev libqt5opengl5-dev libsqlite3-dev qt5-default
         fi
 
         download_extract "https://cmake.org/files/v3.6/cmake-3.6.2-Linux-x86_64.tar.gz" cmake-3.6.2-Linux-x86_64.tar.gz
@@ -72,18 +38,9 @@ travis_install() {
 
     # Android NDK + GCC 4.8
     if [ "$PPSSPP_BUILD_TYPE" = "Android" ]; then
-        free -m
-        sudo apt-get install ant -qq
         download_extract_zip http://dl.google.com/android/repository/${NDK_VER}-linux-x86_64.zip ${NDK_VER}-linux-x86_64.zip
     fi
 
-    if [ "$PPSSPP_BUILD_TYPE" = "macOS" ]; then
-        brew_install sdl2
-        brew upgrade python
-    elif [ "$PPSSPP_BUILD_TYPE" = "iOS" ]; then
-        brew upgrade python
-    fi
-
     # Ensure we're using ccache
     if [[ "$CXX" = "clang" && "$CC" == "clang" ]]; then
         export CXX="ccache clang" CC="ccache clang"

.travis.yml

@@ -4,21 +4,31 @@ sudo: required
 
 language: cpp
 
-dist: trusty
+dist: xenial
 
 addons:
   apt:
+    update: true
     packages:
+      - ant
+      - aria2
       - build-essential
+      - cmake
       - libgl1-mesa-dev
       - libglu1-mesa-dev
-      - cmake
-      - aria2
-      - ant
-      - lib32stdc++6
-      - lib32z1
-      - lib32z1-dev
-      - lib32bz2-1.0
+      - libsdl2-dev
+      - pv
+      - software-properties-common
+    sources:
+      - sourceline: 'ppa:zoogie/sdl2-snapshots'
+      - sourceline: 'ppa:ubuntu-toolchain-r/test'
+      - sourceline: 'ppa:ubuntu-sdk-team/ppa'
+  homebrew:
+    update: true
+    packages:
+      - ccache
+      - python
+      - sdl2
 
 cache:
   apt: true
@@ -75,19 +85,19 @@ matrix:
       env: PPSSPP_BUILD_TYPE=Linux
            LIBRETRO=TRUE
     - os: osx
-      osx_image: xcode8
+      osx_image: xcode8.3
       compiler: "clang"
       env: PPSSPP_BUILD_TYPE=macOS
     - os: osx
-      osx_image: xcode8
+      osx_image: xcode8.3
       compiler: "clang"
       env: PPSSPP_BUILD_TYPE=iOS
 
 before_install:
-  - bash .travis.sh travis_before_install
+  - travis_retry bash .travis.sh travis_before_install
 
 install:
-  - bash .travis.sh travis_install
+  - travis_retry bash .travis.sh travis_install
 
 script:
   - bash .travis.sh travis_script