[issue924] perl links itself against threading library

[walt]

Hasso Tepper wrote:
New submission from Hasso Tepper<hasso at estpak.ee>:

perl links itself against threading library:

$ objdump -x /usr/pkg/bin/perl | grep xu
   NEEDED      libthread_xu.so.2
$
The result is that package compiled in the machine using libthread_xu.so.2 by
default can't be used in the machine using libc_r.so (it only dumps core) and
vice versa.
Hi Hasso,

I think several of us discovered this at the same time.  This is the same
as issue921, for which Simon just committed a fix.  I'm building now :o)