disable bullet native building as the servers mingw install is broken again

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@10027 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

build.xml

@@ -135,8 +135,8 @@
     </target>
 
     <target name="-hudson-build-engine">
-        <ant dir="engine" target="build-bullet-natives"/>
-        <!--ant dir="engine" target="jar"/-->
+        <!--ant dir="engine" target="build-bullet-natives"/-->
+        <ant dir="engine" target="jar"/>
         <ant dir="engine" target="javadoc"/>
         <ant dir="engine" target="update-sdk-nobuild"/>
     </target>