os: clean up checking for IPv6 (!1539) · Merge requests · xorg / xserver · GitLab

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Enrico Weigelt, metux IT consult . requested to merge metux/xserver:submit/check-ipv6 into master May 13, 2024

drop some unnecessary / obsolete ifdef's
explicitly check whether AF_INET6 is available (instead of disabling it silently)
drop unncessary extra check for AF_INET6 all over the sources (just rely on IPv6 define)