Use weakcall for eventfd on FreeBSD.
#718
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`eventfd` was introduced in FreeBSD 13, so it isn't in FreeBSD 12. Use `weakcall` to call it on FreeBSD so that we don't have a link-time dependency on it. Fixes #716.
FreeBSD 12 lacks `ptsname_r`.
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eventfdwas introduced in FreeBSD 13, so it isn't in FreeBSD 12. Useweakcallto call it on FreeBSD so that we don't have a link-time dependency on it.Fixes #716.