async I/O bugfix for systems lacking poll(2)

... such as Mac OS X.  When some selectors are closed,
select(2) returns 
EBADF and does not poll *any selector*; poll(2) instead
marks the error 
and goes on polling the rest.

With this patch I can use gst-remote to start and stop
Seaside or 
Swazoo, as much as I want.  Committed to master and
stable-3.0.

Paolo

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