Remove replacement code for getaddrinfo.

Thomas Munro <tmunro@postgresql.org>

Commit: 5579388d2dda60ded329a4623f9b4529e91a1b24
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2022-08-13T21:53:28Z
Releases: 16.0
Remove replacement code for getaddrinfo.

SUSv3, all targeted Unixes and modern Windows have getaddrinfo() and
related interfaces.  Drop the replacement implementation, and adjust
some headers slightly to make sure that the APIs are visible everywhere
using standard POSIX headers and names.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CA%2BhUKG%2BL_3brvh%3D8e0BW_VfX9h7MtwgN%3DnFHP5o7X2oZucY9dg%40mail.gmail.com

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