linux emulation file descriptor leakage -current?

[Bakul Shah]

> Can you please "portupgrade -fo emulators/linux_base-fc3 linux_base"
> and try again (fc3 is the upcomming new default linux base)?
> 
> If the behavior is still the same after this change, please send a PR
> for this.

The behavior is different; it now eats file descriptors at
least twice as fast.  This just goes to show just how
different we are from Microsoft.  Even our bugs get faster!
Equal and better opportunity for all!  Democracy in action!
What a countrrrry....

Ok, I'll file a PR.