03cf221934
We customarily #include <netinet/in.h> before <arpa/inet.h>; according to our git history (cf commit 527f8babc) there used to be platform(s) where <arpa/inet.h> didn't compile otherwise. That's probably not really an issue anymore, but since test_ifaddrs.c is the one and only place in our code that's not following that rule, bring it into line. Also remove #include <sys/socket.h>, as that's duplicative given that libpq/ifaddr.h does so (via pqcomm.h). In passing, add a .gitignore file so nobody accidentally commits the test_ifaddrs executable, as I nearly did. I see no particular need to back-patch this, as it's just neatnik-ism considering we don't build test_ifaddrs by default, or even document it anywhere.
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