Add include files to get prototype declarations, and fix bugs found.

Add include files to get prototype declarations, and fix bugs found.

SCCS-vsn: lib/libc/gen/alarm.c 5.5
SCCS-vsn: lib/libc/gen/closedir.c 5.9
SCCS-vsn: lib/libc/gen/crypt.c 5.4
SCCS-vsn: lib/libc/gen/ctime.c 5.26
SCCS-vsn: lib/libc/gen/disklabel.c 5.17
SCCS-vsn: lib/libc/gen/fnmatch.c 5.4
SCCS-vsn: lib/libc/gen/frexp.c 5.3
SCCS-vsn: lib/libc/gen/fstab.c 5.15
SCCS-vsn: lib/libc/gen/getcwd.c 5.10
SCCS-vsn: lib/libc/gen/getgrent.c 5.8
SCCS-vsn: lib/libc/gen/getlogin.c 5.9
SCCS-vsn: lib/libc/gen/getmntinfo.c 6.4
SCCS-vsn: lib/libc/gen/getpass.c 5.8
SCCS-vsn: lib/libc/gen/getttyent.c 5.9
SCCS-vsn: lib/libc/gen/getusershell.c 5.7
SCCS-vsn: lib/libc/gen/glob.c 5.4
SCCS-vsn: lib/libc/gen/initgroups.c 5.7
SCCS-vsn: lib/libcompat/4.3/insque.c 5.4
SCCS-vsn: lib/libc/gen/isatty.c 5.6
SCCS-vsn: lib/libc/gen/nice.c 5.5
SCCS-vsn: lib/libc/gen/nlist.c 5.8
SCCS-vsn: lib/libc/mips/gen/nlist.c 5.8
SCCS-vsn: lib/libc/gen/opendir.c 5.11
SCCS-vsn: lib/libc/gen/pause.c 5.7
SCCS-vsn: lib/libc/gen/popen.c 5.15
SCCS-vsn: lib/libc/gen/psignal.c 5.6
SCCS-vsn: lib/libcompat/4.3/regex.c 5.4
SCCS-vsn: lib/libcompat/4.3/remque.c 5.4
SCCS-vsn: lib/libc/gen/scandir.c 5.10
SCCS-vsn: lib/libc/compat-43/setrgid.c 5.5
SCCS-vsn: lib/libc/gen/setjmperr.c 5.8
SCCS-vsn: lib/libc/compat-43/setruid.c 5.5
SCCS-vsn: lib/libc/gen/siglist.c 5.6
SCCS-vsn: lib/libc/gen/sigsetops.c 5.3
SCCS-vsn: lib/libc/gen/sleep.c 5.6
SCCS-vsn: lib/libc/gen/syslog.c 5.33
SCCS-vsn: lib/libc/gen/telldir.c 5.9
SCCS-vsn: lib/libc/gen/termios.c 5.4
SCCS-vsn: lib/libc/gen/timezone.c 5.10
SCCS-vsn: lib/libc/gen/ttyname.c 5.8
SCCS-vsn: lib/libc/gen/ttyslot.c 5.6
SCCS-vsn: lib/libc/gen/ualarm.c 5.5
SCCS-vsn: lib/libc/gen/unvis.c 1.4
SCCS-vsn: lib/libc/gen/usleep.c 5.6
SCCS-vsn: lib/libc/gen/utime.c 5.4
SCCS-vsn: lib/libc/gen/valloc.c 5.5
SCCS-vsn: lib/libc/gen/vis.c 5.4
SCCS-vsn: lib/libc/gen/wait.c 5.4
SCCS-vsn: lib/libc/gen/wait3.c 5.6
SCCS-vsn: lib/libc/gen/waitpid.c 5.4