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-storage-am-btree/pom.xml b/hyracks/hyracks-storage-am-btree/pom.xml
index 118d46d..a1f362e 100644
--- a/hyracks/hyracks-storage-am-btree/pom.xml
+++ b/hyracks/hyracks-storage-am-btree/pom.xml
@@ -20,6 +20,7 @@
         <configuration>
           <source>1.6</source>
           <target>1.6</target>
+          <fork>true</fork>
         </configuration>
       </plugin>
     </plugins>