[Toybox] [PATCH] getty/telnet/tftpd: minor cleanup.

[enh]

Remove STDIN_FILENO and use FLAG().

Use xsetspeed() rather than have a duplicate table.

Inline getty's print_prompt().

There's still a lot of cleanup needed here, in particular use of toybuf
and removal of the inappropriately-named HOSTNAME_SIZE (and ideally
sharing that logic with login(1) which already contains a better
implementation of it).
---
 toys/pending/getty.c  | 160 +++++++++++++-----------------------------
 toys/pending/telnet.c |   8 +--
 toys/pending/tftpd.c  |  10 +--
 3 files changed, 58 insertions(+), 120 deletions(-)
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