Re: renameatu: fix test failure on MSVC

[Bruno Haible]

> 2019-07-02  Bruno Haible  <br...@clisp.org>
> 
>       renameatu: Fix test failure on MSVC.
>       * lib/at-func2.c (at_func2): Fail with ENOENT if file1 or file2 is the
>       empty string.

There was no comment in two days. So I'm pushing this.

Bruno