Fix build error when retrieving Moxie jar

build.xml

@@ -12,6 +12,7 @@
 	<property name="moxie.dir" value="${user.home}/.moxie" />
 	
 	<!-- Download Moxie from it's Maven repository to user.home -->
+	<mkdir dir="${moxie.dir}" />
 	<get src="${moxie.url}/org/moxie/moxie-toolkit/${moxie.version}/${moxie.jar}"
 		dest="${moxie.dir}" skipexisting="true" verbose="true" />