FreeBSD build fix, v4.
libcs like musl essentially only expose defines/symbols present in ISO C by default, and require use of defines to expose symbols in POSIX, SUS, X/Open, etc. But, systems like FreeBSD instead define nearly everything by default and then *remove* definitions if you use feature test macros. This means we can't use symbols like O_NDELAY (a BSD extension which FreeBSD removes in X/Open mode) or INADDR_LOOPBACK (not in C or POSIX for some reason), and need to use a looser include to expose gettimeofday (present in X/Open but not in POSIX). As always, tested on glibc and musl but I'll have to wait for CI for FreeBSD.
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