- create properties folder in build script before writing properties

git-svn-id: https://jmonkeyengine.googlecode.com/svn/trunk@7090 75d07b2b-3a1a-0410-a2c5-0572b91ccdca

build.xml

@@ -66,6 +66,7 @@
 
     <target name="-update-sdk-platform-config">
         <property name="nbplatform.dir" location="netbeans"/>
+        <mkdir dir="sdk/nbproject/private"/>
         <echo file="sdk/nbproject/private/platform-private.properties"
               message="nbplatform.default.netbeans.dest.dir=${nbplatform.dir}&#xa;"/>
         <echo file="sdk/nbproject/private/platform-private.properties"