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/libcompat/4.3/rexec.c 5.9
SCCS-vsn: lib/libcompat/4.3/ruserpass.c 5.8
SCCS-vsn: lib/libcompat/4.1/vtimes.c 5.3
SCCS-vsn: lib/libplot/bitgraph/close.c 5.3
SCCS-vsn: lib/libplot/bitgraph/open.c 5.3
SCCS-vsn: lib/libplot/dumb/close.c 5.2
SCCS-vsn: lib/libplot/dumb/open.c 5.2
SCCS-vsn: lib/libplot/gigi/close.c 5.2
SCCS-vsn: lib/libplot/gigi/open.c 5.2
SCCS-vsn: lib/libplot/hp7221/close.c 5.2
SCCS-vsn: lib/libplot/hp7221/open.c 5.2
SCCS-vsn: lib/librpc/rpc/get_myaddress.c 1.3
SCCS-vsn: lib/librpc/rpc/bindresvport.c 1.2
SCCS-vsn: lib/librpc/rpc/pmap_rmt.c 1.3
SCCS-vsn: lib/librpc/rpc/svc_udp.c 1.2
SCCS-vsn: lib/librpc/rpc/xdr_rec.c 1.2
SCCS-vsn: lib/libutil/pty.c 5.2