.travis.yml: remove deployment of android-natives from ubuntu build so they don't conflict with the android build matrix (#1171)

.travis.yml

@@ -57,7 +57,7 @@ cache:
     - $HOME/.gradle/wrapper/
 
 install:
-  - '[ -n "$UPLOAD_NATIVE" ] && ./gradlew -PbuildNativeProjects=true assemble || ./gradlew assemble'
+  - '[ -n "$UPLOAD_NATIVE" ] && ./gradlew -PbuildNativeProjects=true assemble -xjme3-android-native:assemble -xjme3-bullet-native-android:assemble || ./gradlew assemble -xjme3-android-native:assemble -xjme3-bullet-native-android:assemble'
 
 script:
   - ./gradlew check