[rfa/hpux] Handle core files better for hppa64-hp-hpux11.11

[John David Anglin]

> Pls apply if ok.

Done.  I made some minor formatting changes.

Thanks,
Dave
-- 
J. David Anglin                                  dave.anglin@nrc-cnrc.gc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6602)