Avoid warning --jit when only YJIT is enabled

ruby.c

@@ -1421,10 +1421,10 @@ proc_long_options(ruby_cmdline_options_t *opt, const char *s, long argc, char **
         ruby_verbose = Qtrue;
     }
     else if (strcmp("jit", s) == 0) {
-#if !USE_RJIT
-        rb_warn("Ruby was built without JIT support");
-#else
+#if USE_YJIT || USE_RJIT
         FEATURE_SET(opt->features, FEATURE_BIT(jit));
+#else
+        rb_warn("Ruby was built without JIT support");
 #endif
     }
     else if (is_option_with_optarg("rjit", '-', true, false, false)) {