Make it clear --help is handled by org.graalvm.launcher.Launcher#printDefaultHelp

Author: eregon

src/launcher/java/org/truffleruby/launcher/CommandLineParser.java

@@ -432,8 +432,10 @@ private void processArgument() throws CommandLineException {
                         disallowedInRubyOpts(argument);
                         warnInternalDebugTool(argument);
                         break FOR;
-                    } else if (rubyOpts && argument.equals("--help")) {
+                    } else if (argument.equals("--help")) {
                         disallowedInRubyOpts(argument);
+                        // --help is handled by org.graalvm.launcher.Launcher#printDefaultHelp
+                        config.getUnknownArguments().add(argument);
                         break FOR;
                     } else if (argument.equals("--version")) {
                         disallowedInRubyOpts(argument);

src/launcher/java/org/truffleruby/launcher/RubyLauncher.java

@@ -372,9 +372,7 @@ private void printPreRunInformation(CommandLineOptions config) {
             case SHORT:
                 printShortHelp(getOutput());
                 break;
-            case LONG:
-                printHelp(getOutput());
-                break;
+            // --help is handled by org.graalvm.launcher.Launcher#printDefaultHelp
         }
     }
 

src/launcher/java/org/truffleruby/launcher/ShowHelp.java

@@ -11,6 +11,6 @@
 
 public enum ShowHelp {
     NONE,
-    SHORT,
-    LONG
+    SHORT // -h
+    // LONG // --help is handled by org.graalvm.launcher.Launcher#printDefaultHelp
 }