CI: make sure vcreate.v is not skipped by `v build-tools`

cmd/tools/vcreate.v

@@ -1,3 +1,5 @@
+module main
+
 // Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
 // Use of this source code is governed by an MIT license that can be found in the LICENSE file.
 //
@@ -5,7 +7,6 @@
 // structure of the program in the _current_ directory, while `new`
 // makes the program structure in a _sub_ directory. Besides that, the
 // functionality is essentially the same.
-module main
 
 import os