PATCH: emacs-20.7 was trying read /var/adm/wtmp whenever I would start modifying a file(!)

[Adam J. Richter]

        I had been wondering why emacs seemed to be developing such
a long delay when I would make the first modification to a previously
unmodified file buffer.  strace revealed that it was reading all of
var/adm/wtmp!

        Some exploration of the code revealed that in
emacs-20.7/src/filelock.c, get_boot_time was trying to determine
the last boot time by reading /etc/utmp and then /var/adm/wtmp.
I believe I may have a configuration problem that caused emacs
to fall back to /var/adm/wtmp (and I will look into that), but,
at least on a Linux system, there is a much faster way to get
the up time: /proc/uptime.  I have attached a patch below that
fixes this problem.

-- 
Adam J. Richter     __     ______________   4880 Stevens Creek Blvd, Suite 104
adam@yggdrasil.com     \ /                  San Jose, California 95129-1034
+1 408 261-6630         | g g d r a s i l   United States of America
fax +1 408 261-6631      "Free Software For The Rest Of Us."

diffs.emacs
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