[Adding automake-patches]

Reference: <http://debbugs.gnu.org/11089>

> On Sun, Mar 25, 2012 at 11:20 AM, Stefano Lattarini wrote:
>
> I'd describe this as an automake limitation; not sure if it's worth
> fixing (since yours is not a common use case, and the issue you're
> facing has a simple-enough workaround, as you've already found out);
> but it would be worth documenting IMHO.
>
On a second thought, I've been unable to find a way to document Jason's
workaround that doesn't sound cumbersome and clumsy; so maybe it's better
to just drop this documentation change.

Still, having a test case verifying that such a workaround actually works
is still worthwhile and easy to do.  This is what the attached patch does.
I will push it this evening or tomorrow if there is no objection.

Regards,
  Stefano