Clean up process wait to use POSIX waitpid() interface.

[mmh] / sbr / done.c

/*
 * done.c -- terminate the program
 *
 * This code is Copyright (c) 2002, by the authors of nmh.  See the
 * COPYRIGHT file in the root directory of the nmh distribution for
 * complete copyright information.
 */

#include <h/mh.h>

void (*done) (int) NORETURN = exit;