Poll.fdIgnored

Mark fd as ignored so that the next call to [gst.poll.Poll.wait] will yield the same result for fd as last time. This function must be called if no operation (read/write/recv/send/etc.) will be performed on fd before the next call to [gst.poll.Poll.wait].

The reason why this is needed is because the underlying implementation might not allow querying the fd more than once between calls to one of the re-enabling operations.