update LICENSE date

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src/66-tools/66-clock.c

src/66-tools/66-getenv.c

src/66-tools/66-gnwenv.c

src/66-tools/66-ns.c

src/66-tools/66-olexec.c

src/66-tools/66-which.c

src/66-tools/66-writenv.c

src/66-tools/66-yeller.c

src/66-tools/execl-cmdline.c

src/66-tools/execl-subuidgid.c

src/66-tools/execl-toc.c