98e93a1fc9
The point of this patch is to reduce inclusion spam by not needing to #include <netdb.h> or <pwd.h> in port.h (which is read by every compile in our tree). To do that, we must remove port.h's declarations of pqGetpwuid and pqGethostbyname. pqGethostbyname is only used, and is only ever likely to be used, in src/port/getaddrinfo.c --- which isn't even built on most platforms, making pqGethostbyname dead code for most people. Hence, deal with that by just moving it into getaddrinfo.c. To clean up pqGetpwuid, invent a couple of simple wrapper functions with less-messy APIs. This allows removing some duplicate error-handling code, too. In passing, remove thread.c from the MSVC build, since it contains nothing we use on Windows. Noted while working on 376ce3e40. Discussion: https://postgr.es/m/1634252654444.90107@mit.edu
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