Note deprecation of ClassicPluginStrategy#useAntClassLoader

core/src/main/java/hudson/ClassicPluginStrategy.java

@@ -716,6 +716,8 @@ public class ClassicPluginStrategy implements PluginStrategy {
         }
     }
 
+    /* Unused since 1.527, see https://github.com/jenkinsci/jenkins/commit/47de54d070f67af95b4fefb6d006a72bb31a5cb8 */
+    @Deprecated
     public static boolean useAntClassLoader = SystemProperties.getBoolean(ClassicPluginStrategy.class.getName()+".useAntClassLoader");
     public static boolean DISABLE_TRANSFORMER = SystemProperties.getBoolean(ClassicPluginStrategy.class.getName()+".noBytecodeTransformer");
 }