A BSD-style wait4 implementation.

Using existing code from the posixmodule.c and
resource.c files,
I threw together a patch that implements the wait4
function.

This function is similar to waitpid, but it also
returns usage information
about the child process.

wait4(pid, options) -> (pid, status, rusage)

It works for me on RedHat Linux 9 and FreeBSD 4.5 boxes
using
Python-2.3.4.

The patch may need some fine tuning.

Thanks
Chad