[patch] Fix watch_thread_num testcase for ppc32

[Joel Brobecker]

> The watch_thread_num.exp testcase was timing out on a number of
> iterations for PPC32, while giving a full pass for PPC64. Removing the
> usleep(1) call fixed the problem. It gives full passes for both PPC
> 32/64.

Would you mind sending the log files when it times out? I don't
understand why removing the usleep fixes the problem. I'm a bit
concerned with removing this delay because the thread would then
be free to eat up all the CPU, and the test is creating quite a
number of them...

Thanks,
-- 
Joel