[project @ 2002-07-24 03:38:58 by sof]

awaitEvent: if select() reports EBADF,
always unblock all waiting threads, even if
the prior invocation of select() also
elicited an EBADF.

The 'smart' that was there previously runs
the risk of working against us (if the EBADFs are
coming from different fds), so the above
scheme is preferable (and simpler.)