- Rename getpty() to xgetpty() and adjust callers.

- Rewrite kbd_mode and setconsole
- Introduce and use console_make_active() and xopen_xwrite_close()
- honour buffer-reservation method as set by the user (dumpkmap, loadkmap)
- shrink rtcwake and some console-tools

  Saves about 270 Bytes

libbb/Kbuild

@@ -98,6 +98,7 @@ lib-y += vfork_daemon_rexec.o
 lib-y += warn_ignoring_args.o
 lib-y += wfopen.o
 lib-y += wfopen_input.o
+lib-y += write.o
 lib-y += xatonum.o
 lib-y += xconnect.o
 lib-y += xfuncs.o