Fix rtprio() to do sensible things when called from threaded processes.

It's not quite correct from a posix Point Of view, but it is a lot better
than what was there before. This will be revisited later
when we decide what form our priority extensions will take. Posix doesn't
specify  how a system scope thread can change its priority so you need to
add non-standard extensions to be able to do it..
For now make this slightly non standard to allow it to be done.

Submitted by:	Dan Eischen originally, changed by myself.

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