Remove unused plugin from pom

buildnumber-maven-plugin is no longer used in Commons Parent.

Author: aherbert

pom.xml

@@ -358,16 +358,6 @@
           </archive>
         </configuration>
       </plugin>
-      <plugin>
-        <groupId>org.codehaus.mojo</groupId>
-        <artifactId>buildnumber-maven-plugin</artifactId>
-        <configuration>
-          <!-- buildnumber-maven-plugin:
-            "for git getLastChangedRevision() returns null instead of the last revision"
-            Override CP to use the last revision of the repository (OK for release jars). -->
-          <useLastCommittedRevision>false</useLastCommittedRevision>
-        </configuration>
-      </plugin>
     </plugins>
   </build>