t/spawn.t: workaround OpenBSD RLIMIT_CPU delays

RLIMIT_CPU on OpenBSD doesn't work reliably with few syscalls or
on mostly idle systems.  Even at its most accurate, it takes an
extra second to fire compared to FreeBSD or Linux due to
internal accounting differences, but worst case even the SIGKILL
can be 50s delayed.

So rewrite the CPU burner script in Perl where we can unblock
SIGXCPU and reliably use more syscalls.

Link: https://marc.info/?i=20230829010110.M269767@dcvr

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