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There are currently three functions that call NtQueryInformationFile to determine the state of a pipe instance. Do this only once, in a new fifo_client_handler::set_state () function, and call that when state information is needed. Remove the fifo_client_handler methods pipe_state and get_state, which are no longer needed. Make fhandler_fifo::get_fc_handler return a reference, for use in select.cc:peek_fifo. Make other small changes to ensure that this commit doesn't change any decisions based on the state of a fifo_client_handler. The tricky part is interpreting FILE_PIPE_CLOSING_STATE, which we translate to fc_closing. Our current interpretation, which is not changing as a result of this commit, is that the writer at the other end of the pipe instance is viewed as still connected from the point of view of raw_read and determining EOF. But it is not viewed as still connected if we are deciding whether to unblock a new reader that is trying to open.
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