main/utmps: fix syntax error in utmp-init
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fix missing-backtick syntax error in utmp-init script
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fix APKBUILD lint warning
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add kernel version to "host" field of written initial utmp records. Busybox already does the same for "shutdown" utmp records it writes and this appears to be normal practice (e.g. Debian does the same). Also this page, https://blog.stevedoria.net/20191029/utmpdump, indicates that field 6 can contain kernel version.