Use FileUtils, should fix PR 45190

git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@668624 13f79535-47bb-0310-9956-ffa450edef68

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

@@ -342,7 +342,7 @@ public abstract class Definer extends DefBase {
         }
         try {
             if (message == null) {
-                return file.toURL();
+                return FileUtils.getFileUtils().getFileURL(file);
             }
         } catch (Exception ex) {
             message =