BuildStepCompatibilityLayer already implements BuildStep, so its subclasses...

BuildStepCompatibilityLayer already implements BuildStep, so its subclasses need not say they do as well.

core/src/main/java/hudson/tasks/Builder.java

@@ -42,7 +42,7 @@ import jenkins.model.Jenkins;
  *
  * @author Kohsuke Kawaguchi
  */
-public abstract class Builder extends BuildStepCompatibilityLayer implements BuildStep, Describable<Builder>, ExtensionPoint {
+public abstract class Builder extends BuildStepCompatibilityLayer implements Describable<Builder>, ExtensionPoint {
     
 
 //

core/src/main/java/hudson/tasks/Publisher.java

@@ -60,7 +60,7 @@ import java.util.Comparator;
  *
  * @author Kohsuke Kawaguchi
  */
-public abstract class Publisher extends BuildStepCompatibilityLayer implements BuildStep, Describable<Publisher> {
+public abstract class Publisher extends BuildStepCompatibilityLayer implements Describable<Publisher> {
     /**
      * @deprecated
      *      Don't extend from {@link Publisher} directly. Instead, choose {@link Recorder} or {@link Notifier}