Make <javadoc> ignore .java files in directories containing a "-".

You cannot have a package name with a "-" in it anyway so these files
are something different. In my case I had example files in the
.../doc-files directory and javadoc died because I've used the same
classname (Example) in several places.


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@267992 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/taskdefs/Javadoc.java

@@ -843,7 +843,8 @@ public class Javadoc extends Task {
     					return false;
     				}
     				File d = new File(dir1, name);
-    				if (d.isDirectory()) {
+    				if (d.isDirectory() 
+                                    && d.getName().indexOf("-") == -1) {
     					return true;
     				}
     				return false;