Refactor dlopen() support
Nowadays, all platforms except Windows and older HP-UX have standard
dlopen() support. So having a separate implementation per platform
under src/backend/port/dynloader/ is a bit excessive. Instead, treat
dlopen() like other library functions that happen to be missing
sometimes and put a replacement implementation under src/port/.
Discussion: https://www.postgresql.org/message-id/flat/
e11a49cb-570a-60b7-707d-
7084c8de0e61%402ndquadrant.com#
54e735ae37476a121abb4e33c2549b03
projects / postgresql / commit