Include relevant system headers before defining fallbacks #17129
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Otherwise we may define the fallbacks, and later inclusion of the system headers may attempt to redefine those.
Fixes GH-17112.
Note that I don't know if we need to include both arpa/inet.h and netinet/in.h to avoid this issue for
INADDR_NONE
, but it likely doesn't hurt, and #17124 seems to be a cleaner solution anyway (however, we cannot apply that to stable branches, so this is more a stop-gap measure).cc @nielsdos (since you've fixed the other part of #17112).