Update log4j to 1.2.17

.classpath

@@ -60,7 +60,7 @@
 		</attributes>
 	</classpathentry>
 	<classpathentry kind="lib" path="lib/installer-exclude/libjitsi.jar" sourcepath="../libjitsi/src"/>
-	<classpathentry kind="lib" path="lib/installer-exclude/log4j-1.2.8.jar"/>
+	<classpathentry kind="lib" path="lib/bundle/log4j.jar"/>
 	<classpathentry kind="lib" path="lib/installer-exclude/mac_widgets-0.9.5.jar"/>
 	<classpathentry kind="lib" path="lib/installer-exclude/objenesis-1.2.jar"/>
 	<classpathentry kind="lib" path="lib/installer-exclude/otr4j.jar"/>

build.xml

@@ -2059,21 +2059,6 @@ javax.swing.event, javax.swing.border"/>
             </jar>
     </target>
 
-    <!--BUNDLE-LOG4J -->
-    <target name="bundle-log4j">
-        <jar compress="true" destfile="lib/bundle/log4j.jar"
-            filesetmanifest="merge">
-
-            <zipfileset src="${lib.noinst}/log4j-1.2.8.jar" prefix=""/>
-            <manifest>
-                <attribute name="Export-Package" value="org.apache.log4j"/>
-                <attribute name="Bundle-Name" value="Apache log4j logging system"/>
-                <attribute name="Bundle-Description" value="Logging system."/>
-                <attribute name="System-Bundle" value="yes"/>
-            </manifest>
-        </jar>
-    </target>
-
     <!--BUNDLE-COMMONS-CODEC -->
     <target name="bundle-commons-codec">
         <copy file="${lib.noinst}/commons-codec-1.4.jar"