xinetd: update to 2.3.15.4
Changelog:
https://github.com/openSUSE/xinetd/blob/
1c4d1766d466ec253ed82eee480d2ea534462ac5/CHANGELOG#L935
Instead of the xinetd-org sources, the OpenSUSE fork is used now
because the xinetd-org version is not maintained anymore. This fork
is used by Debian too and obsoletes the patches that were used
previously for the packaging at OpenWrt.
[1] https://github.com/xinetd-org/xinetd/issues/37
[2] https://packages.debian.org/trixie/xinetd
Signed-off-by: Jonas Lochmann <redacted>