[PATCH] make strace more fair wrt many traced processes

[Roland McGrath]

I'm not at all sure about this change.  
Can we back it out until after the next release and think about it harder?

I'm mostly worried about unintended changes of some cases that were
readable before now winding up with lots of <unfinished> lines swapping
back and forth.  But more broadly, about subtle unintended consequences.

I do see the motivation, but we should be wary about perturbing this.
Any order of processing is "kosher".  So there are various trade-offs
to consider like the fairness one you're considering.  But more than one.

I'm not comfortable slipping this in quietly among the bug fixes.


Thanks,
Roland