add poweroff command

hc

2023-12-14 982b8cc116118b3463d3f332581945625722acd8

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perf-y += Context.o
 
CFLAGS_Context.o += $(PYTHON_EMBED_CCOPTS) -Wno-redundant-decls -Wno-strict-prototypes -Wno-unused-parameter -Wno-nested-externs