8.4 win32 shared memory patch

On Win2k3 Std SP2, the service won't start once I've applied the
patch.  In the log, I get:

%t LOG:  CreateProcess call failed: A blocking operation was
interrupted by a call to WSACancelBlockingCall.
 (error code 2)
%t LOG:  could not fork autovacuum worker process: A blocking
operation was interrupted by a call to WSACancelBlockingCall.

[ and then 47k worth of that whole message repeated, and then: ]

%t LOG:  received fast shutdown request
%t LOG:  aborting any active transactions
%t FATAL:  terminating connection due to administrator command
%t FATAL:  terminating connection due to administrator command
%t FATAL:  terminating connection due to administrator command
%t FATAL:  terminating connection due to administrator command
%t FATAL:  terminating connection due to administrator command
%t FATAL:  terminating connection due to administrator command
%t FATAL:  terminating connection due to administrator command
%t FATAL:  terminating connection due to administrator command
%t FATAL:  terminating connection due to administrator command
%t FATAL:  terminating connection due to administrator command
%t FATAL:  terminating connection due to administrator command
%t LOG:  autovacuum launcher shutting down
%t FATAL:  terminating connection due to administrator command
%t LOG:  shutting down
%t LOG:  database system is shut down


(BTW, I noticed the %t everywhere in all of my 8.4 logs, whereas in my
8.3 logs there're actual timestamps instead.  Bug?)

I put the old binary back and it works fine.

Cheers,
Kev