settings: drop unmaintained ifnet settings plugin of Gentoo
Even Gentoo disables this plugin since before 0.9.8 release of NetworkManager. Time to say goodbye. If somebody happens to show up to maintain it, we may resurrect it later. If "$distro_plugins=ifnet" was set, configure.ac would use that to autodetect --with-hostname-persist=gentoo. Replace that autodetect part by checking for /etc/gentoo-release file.
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