crypt32: Avoid relying on PATH_MAX in import_certs_from_dir helper.

[Austin English]

On Thu, Oct 7, 2010 at 6:56 PM, Andrew Nguyen <anguyen at codeweavers.com> wrote:
>
> PATH_MAX is not guaranteed to be available on all platforms, and it is
> inadequate as a hardcoded buffer size anyway.

Also fixes the first compiler error on GNU Hurd.

Thanks Andrew!

-- 
-Austin