Make -projecthelp output display even in -quiet mode.

PR: 17471


git-svn-id: https://svn.apache.org/repos/asf/ant/core/trunk@278367 13f79535-47bb-0310-9956-ffa450edef68

src/main/org/apache/tools/ant/Main.java

@@ -998,6 +998,6 @@ public class Main implements AntMain {
             }
             msg.append(lSep);
         }
-        project.log(msg.toString());
+        project.log(msg.toString(), Project.MSG_WARN);
     }
 }