Re: crash in rl_prep_terminal() without rl_outstream

[Nick Black]

Chet Ramey left as an exercise for the reader:
> Readline provides defaults for rl_instream and rl_outstream the first time
> it's called. These are in place before the first time rl_prep_terminal is
> called. If an application using readline decides to change the file pointer
> assigned to either of these variables, readline allows it.

Hrmmm. I definitely was crashing within rl_prep_terminal() (as
noted with valgrind) until I set this. I'll look deeper into how
this was happening, but gdb verified that rl_outstream was NULL
when the writeouts at the end of this function were hit.

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