add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

 kernel/fs/unicode/Makefile
..
..
@@ -35,4 +35,4 @@
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 endif
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 targets += utf8data.h
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-hostprogs-y += mkutf8data
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+hostprogs += mkutf8data