clean up poms with fork=true

git-svn-id: https://hyracks.googlecode.com/svn/branches/fullstack_job_rewriter@3018 123451ca-8445-de46-9d55-352943316053
diff --git a/hyracks/hyracks-examples/btree-example/btreeclient/pom.xml b/hyracks/hyracks-examples/btree-example/btreeclient/pom.xml
index ba296ac..ebca323 100644
--- a/hyracks/hyracks-examples/btree-example/btreeclient/pom.xml
+++ b/hyracks/hyracks-examples/btree-example/btreeclient/pom.xml
@@ -39,6 +39,7 @@
         <configuration>
           <source>1.6</source>
           <target>1.6</target>
+          <fork>true</fork>
         </configuration>
       </plugin>
       <plugin>