add back deprecation warnings lost during refactoring

src/rc/rc.c

@@ -830,6 +830,8 @@ int main(int argc, char **argv)
 		}
 	}
 
+	if (strcmp(applet, "rc") == 0)
+		ewarnv("rc is deprecated, please use openrc instead.");
 	newlevel = argv[optind++];
 	/* To make life easier, we only have the shutdown runlevel as
 	 * nothing really needs to know that we're rebooting.