Adding a hook in the servlet build file that can be replaced by scripts.

Review by: zundel@google.com

git-svn-id: https://google-web-toolkit.googlecode.com/svn/trunk@10287 8db76d5a-ed1c-0410-87a9-c151d255dfc7
diff --git a/servlet/build.xml b/servlet/build.xml
index e30dace..c5cb923 100755
--- a/servlet/build.xml
+++ b/servlet/build.xml
@@ -38,6 +38,8 @@
         <exclude name="com/google/gwt/junit/server/**" />
         <exclude name="com/google/gwt/benchmarks/*" />
       </fileset>
+
+      <!-- additional dependencies (used by scripts). -->
     </gwt.jar>
   </target>