Hi,

when evaluating zsh as the new default shell for interactive use it was
discovered, that the 'watch' feature doesn't work on Solaris 11.3 and
Ubuntu 14.04, 15.04 and probably other modern platforms: 'log' never
shows anything and logins/logouts never show up.

The root cause is, that the current implementation uses a rather
discouraged way to obtain utmp[x] records, i.e. it reads binary records
instead of using the POSIX/recommended way, i.e. {set,get,end}ut[x]ent() -
similar to getpwent(). To check I just inserted a printf: 1st record
seems to be ok but is always of ut_type != USER_PROCESS and all following
records read contain really garbage with ut_type = 0 (probably by
accident). So no wonder, why it doesn't work as expected.

The attached patch fixes the implementation, has been successfully
tested on the platforms mentioned above (was developed against 5.0.7,
which is, what the vendors of the mentioned OS ship, however, someone on
irc reported, that it applies cleanly to the current master version as
well).

Would be nice if it could be merged ASAP. IIRC, we started to evaluate
zsh as default shell 5+ years ago. First test was, whether watch works:
it didn't, but had no time to dig deeper, so we stopped and postponed
the eval ...

have fun,
jel.
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