Fixed emulator options to have builds running in Trusty in Travis CI (#…

…176)

* Edit emulator audio options so that the Android build works in Trusty

.travis.yml

@@ -1,6 +1,6 @@
 language: android
 jdk: oraclejdk8
-dist: precise
+dist: trusty
 env:
   global:
     - ADB_INSTALL_TIMEOUT=8 # 8 minutes (2 minutes by default)
@@ -20,7 +20,7 @@ android:
 
 before_script:
   - echo no | android create avd --force -n test -t android-24 --abi armeabi-v7a
-  - emulator -avd test -no-audio -no-window &
+  - QEMU_AUDIO_DRV=none emulator -avd test -no-window &
   - android-wait-for-emulator
   - adb shell settings put global window_animation_scale 0 &
   - adb shell settings put global transition_animation_scale 0 &