windows builds hanging on regression checks

Something committed in about the last 24 hours or so has caused my 
Windows buildfarm members to hang completely while running the 
regression tests. It's happened for both MinGW and MSVC builds.

To get the buildfarm run to complete in some fashion, I had to kill 2 
psql processes, and then 2 dwwin processes. The result was this: 
http://www.pgbuildfarm.org/cgi-bin/show_log.pl?nm=dawn_bat&dt=2008-05-17%2012:28:51

The most likely candidate looks to me like this one :"Implement error 
checking for pthreads calls in thread-safe mode." but that's just a guess.

cheers

andrew