For Travis CI - reduce the AVD waiting time to 1 minutes instead.

There is no point to wait for AVD to start. By the time the CI finishes the build, if the emulator is able to start the AVD then it should have been already done so.
On non-CI environment, the build time could still be much faster than the emulator starting the AVD, thus the function to wait for AVD is still useful in non-CI environment.

Rakefile

@@ -341,7 +341,7 @@ def makefile_ci
   # Make, deploy, and test run Android APK in an Android (virtual) device
   if ENV['AVD']
     system "cd #{platform_prefix}Build && android update project -p . -t $( android list target |grep android-$API |cut -d ' ' -f2 ) && ant debug" or abort 'Failed to make Urho3D Samples APK'
-    if android_wait_for_device 20 # minutes
+    if android_wait_for_device ENV['CI'] ? 1 : 10 # minutes
       system "cd #{platform_prefix}Build && ant installd" or abort 'Failed to deploy Urho3D Samples APK'
       android_test_run or abort 'Failed to test run Urho3D Samples APK'
     else