[kaffe] posix threads limits, OpenBSD

[Riccardo]

Hello,

there is a problem when compiling kaffe on OpenBSD 3.4 with unix 
pthreads.
OpenBSD doesn't define _POSIX_THREAD_THREADS_MAX but only PTHREAD_TREADS_
MAX. But the two constants are different.

Since PTHREAD_TREADS_MAX is the maximum number of threads that can be 
created, with a minimum acceptable value of _POSIX_THREAD_THREADS_MAX

Suggestions?

-Riccardo