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dlopen() is in SUSv2 and all targeted Unix systems have it. We still need replacement functions for Windows, but we don't need a configure probe for that. Since it's no longer needed by other operating systems, rename dlopen.c to win32dlopen.c and move the declarations into win32_port.h. Likewise, the macros RTLD_NOW and RTLD_GLOBAL now only need to be defined on Windows, since all targeted Unix systems have 'em. Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us> Reviewed-by: Andres Freund <andres@anarazel.de> Discussion: https://postgr.es/m/CA+hUKGJ3LHeP9w5Fgzdr4G8AnEtJ=z=p6hGDEm4qYGEUX5B6fQ@mail.gmail.com