Incorporate some NetBSD changes:

Incorporate some NetBSD changes:
tip.c
    getchar() returns an int [important since EOF == -1] (thorpej)
    Set CLOCAL if dc flag is set (mellon)
tip.h
    Change booleans from char to short so that comparisons against negative
    values work as expected on systems with unsigned chars. (thorpej)
    Add boolean for dc flag (mellon)
hunt.c
    Set O_NONBLOCK if dc flag set. Don't set HUPCL if dc flag is set. (mellon)
remote.c
    Add boolean for dc flag (mellon)