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/rand.c

@@ -126,6 +126,9 @@ int rand_main(int argc, char **argv)
     if (sscanf(argv[0], "%d", &num) != 1 || num < 0)
         goto opthelp;
 
+    if (!app_load_modules(NULL))
+        goto end;
+
     app_RAND_load_file(NULL, (inrand != NULL));
     if (inrand != NULL)
         BIO_printf(bio_err, "%ld semi-random bytes loaded\n",