Fix ld segfaults under hppa64-hp-hpux11

[John David Anglin]

> It's also possible that it's complaining about the PLTGOT value, which is
> zero, which I find rather odd.  It should have a value like
> 0x80000000xxxxxxxx.

I believe that I have found the problem.  The PLTGOT value isn't being
computed correctly when the PLT section is stripped.  The hppa_info->plt_sec
value needs to be reset to NULL when the PLT section is stripped, etc.

Dave
-- 
J. David Anglin                                  dave.anglin@nrc.ca
National Research Council of Canada              (613) 990-0752 (FAX: 952-6605)