Add missing AI flags for NetBSD and OpenBSD:
- NetBSD: Add AI.SRV flag at bit 11 (0x00000800)
- OpenBSD: Add AI.EXT flag at bit 3 and AI.FQDN flag at bit 5

Add missing NI (getnameinfo) flag definitions for all BSDs and Darwin:
- FreeBSD/Haiku: NOFQDN, NUMERICHOST, NAMEREQD, NUMERICSERV, DGRAM, NUMERICSCOPE
- DragonFly/NetBSD: Same flags with NUMERICSCOPE at bit 6 (deprecated WITHSCOPEID at bit 5 is skipped)
- OpenBSD: NUMERICHOST, NUMERICSERV, NOFQDN, NAMEREQD, DGRAM (no NUMERICSCOPE)
- macOS/Darwin: NOFQDN, NUMERICHOST, NAMEREQD, NUMERICSERV, DGRAM, NUMERICSCOPE at bit 8 (deprecated WITHSCOPEID at bit 5 is skipped)

References:
- NetBSD: https://github.com/NetBSD/src/blob/trunk/include/netdb.h
- OpenBSD: https://github.com/openbsd/src/blob/master/include/netdb.h
- FreeBSD: https://github.com/freebsd/freebsd-src/blob/master/include/netdb.h
- DragonFly BSD: https://github.com/DragonFlyBSD/DragonFlyBSD/blob/master/include/netdb.h
- Haiku: https://github.com/haiku/haiku/blob/master/headers/posix/netdb.h
- macOS/Darwin: https://github.com/apple-oss-distributions/Libinfo/blob/main/lookup.subproj/netdb.h