bug#64937: "who" reports funny dates

[Paul Eggert]

Thanks for doing all that work. I looked into it, and found a problem: a 
command like "who /var/log/wtmp" stops working because the systemd 
emulation of read_utmp only supports plain "who" (rougnly equivalent to 
"who /var/run/utmp" on Fedora). So I installed it into coreutils, but 
the default is systemd is disabled. This should give people time to 
experiment with it.

Thorsten, is there some way to get the equivalent of /var/log/wtmp with 
systemd?

Also, I simplified the use of the new readutmp interface a bit, by going 
back to the old way where you simply call 'free' once to free the 
storage. Although I toyed with the idea of simplifying readutmp.h 
further, by moving most of it into readutmp.c and having just struct 
gl_utmp public (this would simplify coreutils quite a bit), I ran out of 
time and patience and decided to ship what I had. So I nstalled the 
first ten attached patches into Gnulib, and the last patch into coreutils.

I haven't tested this with the latest systemd so there could well be 
typos in that part of the code.

0001-readutmp-simplify-extract_trimmed_name-via-ximemdup0.patch
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0002-readutmp-go-back-to-simple-free.patch
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0003-readutmp-fix-idx_t-FIXME-in-API.patch
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0004-readutmp-pacify-Wstrict-prototypes.patch
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0005-readutmp-fix-indentation.patch
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0006-readutmp-switch-new-struct-to-struct-timespec.patch
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0007-readutmp-systemd-supports-only-UTMP_FILE.patch
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0008-readutmp-fix-comments.patch
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0009-m4-systemd.m4-Fix-help-lineup.patch
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0001-maint-Update-after-gnulib-module-readutmp-changed.patch
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