Make sure we include dnsjava library only once in bundles.

build.xml

@@ -2762,7 +2762,6 @@ javax.swing.event, javax.swing.border"/>
                 <exclude name="dns/**"/>
             </zipfileset>
             <zipfileset src="lib/installer-exclude/laf-widget.jar" prefix=""/>
-            <zipfileset src="${lib.noinst}/dnsjava.jar" prefix=""/>
         </jar>
     </target>
 </project>

src/net/java/sip/communicator/plugin/desktoputil/desktoputil.manifest.mf

@@ -63,5 +63,4 @@ Export-Package: net.java.sip.communicator.plugin.desktoputil,
  net.java.sip.communicator.plugin.desktoputil.plaf,
  net.java.sip.communicator.plugin.desktoputil.presence,
  net.java.sip.communicator.plugin.desktoputil.transparent,
- net.java.sip.communicator.plugin.desktoputil.wizard,
- org.xbill.DNS
+ net.java.sip.communicator.plugin.desktoputil.wizard

src/net/java/sip/communicator/util/util.manifest.mf

@@ -56,7 +56,7 @@ Import-Package: com.sun.awt,
  sun.awt.shell,
  sun.net.dns,
  sun.net.util
-Export-Package: net.java.sip.communicator.util,
+Export-Package: org.xbill.DNS, net.java.sip.communicator.util,
  net.java.sip.communicator.util.launchutils,
  net.java.sip.communicator.util.skin,
  net.java.sip.communicator.util.xml,