Remove ignored -1.1 switch warning

Author: perceptron8

src/main/java/org/apache/maven/plugins/javadoc/AbstractJavadocMojo.java

@@ -4324,10 +4324,6 @@ private void addJavadocOptions(
 
         // all options in alphabetical order
 
-        if (old && getLog().isWarnEnabled()) {
-            getLog().warn("Javadoc 1.4+ doesn't support the -1.1 switch anymore. Ignore this option.");
-        }
-
         addArgIfNotEmpty(arguments, "-bootclasspath", JavadocUtil.quotedPathArgument(getBootclassPath()));
 
         if (breakiterator) {