hang on reboot with -Current

[David Gurvich]

Backing out int_machdep.c does not affect this.  Nor does booting with 
or without ACPI.  What is the method to back out libpthread support?  
Wanted to test that next.  The nvidia-driver works on iso-image 
2/22/2004 which does not include libpthread, as well as being more 
stable in general.  5.2.1-Current worked when there were hanging 
dependencies which were cleaned out with a new buildworld buildkernel 
cycle.