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Corinna Vinschen 32b668d966 Don't raise SIGTTIN from poll/select
SIGTTIN should be raised when read() is made on a tty in a backgrounded
process, but not when it's tested with poll()/select().

I guess poll()/select() does need to call bg_check(), in order to detect the
error conditions that notices (that is, if bg_check() returns bg_eof or
bg_error, then fd is ready as an error condition exists) so add an optional
parameter to fhandler_base::bg_select() to indicate that signals aren't
desired.

See https://cygwin.com/ml/cygwin-developers/2016-07/msg00004.html
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