keventd: use poll.h, not sys/poll.h, fix warning on musl libc
keventd: use poll.h, not sys/poll.h, fix warning on musl libc

Signed-off-by: Joachim Wiberg <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/finit,troglobit/finit