Bump to ooo-build 2.5 since the maven-ant-tasks jar 2.1 uses is no longer available

git-svn-id: svn+ssh://src.earth.threerings.net/nenya/trunk@1173 ed5b42cb-e716-0410-a449-f6a68f950b19

build.xml

@@ -7,7 +7,7 @@
   <property name="classes.dir"  value="${deploy.dir}/classes"/>
   <property name="tclasses.dir" value="${deploy.dir}/test-classes"/>
 
-  <property name="ooo-build.vers" value="2.1"/>
+  <property name="ooo-build.vers" value="2.5"/>
   <ant antfile="etc/bootstrap.xml"/>
   <import file="${user.home}/.m2/ooo-build/${ooo-build.vers}/ooo-build.xml"/>