optarg/optind moved to unistd.h

optarg/optind moved to unistd.h

SCCS-vsn: games/factor/factor.c 8.4
SCCS-vsn: games/gomoku/main.c 8.4
SCCS-vsn: games/number/number.c 8.3
SCCS-vsn: games/pig/pig.c 8.2
SCCS-vsn: games/quiz/quiz.c 8.3
SCCS-vsn: sbin/restore/main.c 8.6
SCCS-vsn: usr.bin/apropos/apropos.c 8.8
SCCS-vsn: usr.bin/basename/basename.c 8.4
SCCS-vsn: usr.bin/col/col.c 8.5
SCCS-vsn: usr.bin/colrm/colrm.c 8.2
SCCS-vsn: usr.bin/column/column.c 8.4
SCCS-vsn: usr.bin/comm/comm.c 8.4
SCCS-vsn: usr.bin/cut/cut.c 8.3
SCCS-vsn: usr.bin/dirname/dirname.c 8.4
SCCS-vsn: usr.bin/du/du.c 8.5
SCCS-vsn: usr.bin/find/main.c 8.4
SCCS-vsn: usr.bin/finger/finger.c 8.5
SCCS-vsn: usr.bin/head/head.c 8.2
SCCS-vsn: usr.bin/hexdump/hexsyntax.c 8.2
SCCS-vsn: usr.bin/hexdump/odsyntax.c 8.2
SCCS-vsn: usr.bin/join/join.c 8.5