Add ppc476 workaround bootstrap test

[Peter Bergner]

On Fri, 2014-02-21 at 10:26 +1030, Alan Modra wrote:
> I was running this by hand to test out --ppc476-workaround.  Another
> bootstrap test doesn't take all that long, so let's add it to the
> testsuite.
> 
> 	* ld-bootstrap/bootstrap.exp: Add ppc476 workaround test.
> 	* ld-bootstrap/ppc476.t: New file.

It looks like you missed committing the ppc476.t file, since I
don't see it in the repository.  It didn't show up in your diff
either.

Peter