Fix ld segfaults under hppa64-hp-hpux11

[law@redhat.com]

In message <200206132221.g5DMLYOm004587@hiauly1.hia.nrc.ca>, "John David Anglin
" writes:
 > > 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.
Hmmm.  In theory PLTGOT is supposed to be optional, so you may be able to
omit it -- it's worth a try.

However, I vaguely remember that HPs use PLTGOT in a nonstandard way, so if
generic code is stripping the PLT because it is unneeded, we may still need
the PLTGOT entry in the .dynamic section.  

jeff