oauth: Fix build on platforms without epoll/kqueue

Daniel Gustafsson <dgustafsson@postgresql.org>

Commit: 8ae0a37932d81082ec7e4b10eb304a83c561408e
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Date: 2025-04-03T18:37:52Z
Releases: 18.0
oauth: Fix build on platforms without epoll/kqueue

register_socket() missed a variable declaration if neither
HAVE_SYS_EPOLL_H nor HAVE_SYS_EVENT_H was defined.

While we're fixing that, adjust the tests to check pg_config.h for one
of the multiplexer implementations, rather than assuming that Windows is
the only platform without support. (Christoph reported this on
hurd-amd64, an experimental Debian.)

Author: Jacob Champion <jacob.champion@enterprisedb.com>
Reported-by: Christoph Berg <myon@debian.org>
Discussion: https://postgr.es/m/Z-sPFl27Y0ZC-VBl%40msg.df7cb.de

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