Simplify termio code.
All non-MSDOS non-WINDOWSNT platforms define HAVE_TERMIOS, so HAVE_TERMIO code is obsolete. Replace HAVE_TERMIOS conditionals with !DOS_NT. * src/systty.h: Do not define HAVE_TCATTR. Remove HAVE_TERMIO, HAVE_LTCHARS and HAVE_TCHARS code. Do not define EMACS_HAVE_TTY_PGRP. Only define EMACS_GET_TTY_PGRP for !DOS_NT. * src/sysdep.c: Include sysselect.h unconditionally. Do not include sys/ioctl.h and termios.h, systty.h does it. Use HAVE_SYS_UTSNAME_H instead of USG as an include guard. (init_baud_rate): Remove HAVE_TERMIO code. (child_setup_tty): Remove HAVE_TERMIO code. (emacs_get_tty, emacs_set_tty): Remove HAVE_TERMIO, HAVE_TCHARS and HAVE_LTCHARS code. Use !DOS_NT instead of HAVE_TCATTR. (new_ltchars, new_tchars): Remove, unused. (init_sys_modes): Remove HAVE_TERMIO, HAVE_TCHARS and HAVE_LTCHARS code. Remove special casing for __mips__, it was a no-op. Remove HAVE_TCATTR conditional, it is implied by HAVE_TERMIOS. (init_sys_modes): Remove HPUX special case. * src/process.c: Include stdlib.h unconditionally. Do not include fcntl.h, systty.h does it. Remove conditional code for HAVE_SERIAL, it is always true. (process_send_signal): Remove HAVE_TERMIOS conditional, it's always true when SIGNALS_VIA_CHARACTERS is true. (Fcontinue_process, Fprocess_send_eof): Simplify conditionals: !WINDOWSNT means HAVE_TERMIOS. (create_process): Remove HAVE_TERMIOS, it's inside a HAVE_PTYS conditional, which is true for all HAVE_TERMIOS systems. * src/keyboard.c (init_keyboard): Do not use HAVE_TERMIO, use !DOS_NT instead of HAVE_TERMIOS. * src/emacs.c (shut_down_emacs): Use !defined DOS_NT instead of EMACS_HAVE_TTY_PGRP. * src/callproc.c (child_setup): Move EMACS_SET_TTY_PGRP use to the non-MSDOS, non-WINDOWSNT code, it's only defined for such systems anyway.
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