update javadoc task of apache-commons plugins

delete excluded file, as they cannot be excluded from javadoc, and errors are fatal since Java 9, see https://bugs.openjdk.java.net/browse/JDK-8176535

git-svn-id: https://josm.openstreetmap.de/osmsvn/applications/editors/josm/plugins@35340 b9d5c4c9-76e1-0310-9c85-f3177eceb1e4

apache-commons/build.xml

@@ -48,4 +48,8 @@
         </javac>
     </target>
 
+	<target name="pre-javadoc">
+        <delete><fileset dir="src" includes="**/org/apache/commons/collections4/bloomfilter/hasher/function/Murmur*.java"/></delete>
+    </target>
+
 </project>

build-common.xml

@@ -277,7 +277,10 @@
             </and>
         </condition>
     </target>
-    <target name="javadoc" unless="skip-javadoc">
+    <target name="pre-javadoc">
+        <!-- to be overidden by plugins that need to perform additional tasks before generating javadoc -->
+    </target>
+    <target name="javadoc" depends="pre-javadoc" unless="skip-javadoc">
         <javadoc destdir="${plugin.doc.dir}"
                 executable="${javadoc.executable}"
                 encoding="UTF-8"