update settings.gradle to include android native bullet project

settings.gradle

@@ -27,6 +27,7 @@ include 'jme3-ios'
 include 'jme3-bullet' //java
 if(buildNativeProjects == "true"){
     include 'jme3-bullet-native' //cpp
+    include 'jme3-bullet-native-android' //cpp
 }
 include 'jme3-android-native' //cpp