new in 1.7.17: select returning -1 with errno equal to zero

[Daniel Colascione]

Since upgrading to Cygwin 1.7.17, I've seen Emacs occasionally print "select
error: no error", indicating that select returned -1 while leaving errno set to
zero. I haven't come up with a repro or simple testcase yet, but I figured I'd
make someone aware of the problem.

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