Restore module loading

The module loading feature got broken a while ago, so restore it, but
have it a bit more explicit this time around.

Reviewed-by: Stephen Henson <steve@openssl.org>

apps/req.c

@@ -380,6 +380,9 @@ int req_main(int argc, char **argv)
     if (verbose)
         BIO_printf(bio_err, "Using configuration from %s\n", template);
     req_conf = app_load_config(template);
+    if (!app_load_modules(req_conf))
+        goto end;
+
     if (req_conf != NULL) {
         p = NCONF_get_string(req_conf, NULL, "oid_file");
         if (p == NULL)