kconfig: make comments stand out in menuconfig

Matěj Laitl <strohel@gmail.com> noticed that there was no way
to distingush between comments and un-selectable menu lines.
This patch marks comments with *** comment ***

Cc: Matěj Laitl <strohel@gmail.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
diff --git a/scripts/kconfig/mconf.c b/scripts/kconfig/mconf.c
index bc5854e..2ee12a7 100644
--- a/scripts/kconfig/mconf.c
+++ b/scripts/kconfig/mconf.c
@@ -481,6 +481,14 @@
 				if (single_menu_mode && menu->data)
 					goto conf_childs;
 				return;
+			case P_COMMENT:
+				if (prompt) {
+					child_count++;
+					item_make("   %*c*** %s ***", indent + 1, ' ', prompt);
+					item_set_tag(':');
+					item_set_data(menu);
+				}
+				break;
 			default:
 				if (prompt) {
 					child_count++;