Add kqueue()-support to pseudo-terminal master devices.

One thing I didn't expect many applications to use, was kqueue() on
pseudo-terminal master devices. There are applications that use kqueue()
on the TTY itself (rtorrent, etc). That doesn't mean we shouldn't
implement this. Libraries like libevent use kqueue() by default, which
means they wouldn't be able to use kqueue().

The old TTY layer implements a very broken version of kqueue() by
performing the actual polling on the TTY device.

Discussed with:	peter

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