strange bug in gettimeofday function

[Andrew Makhorin]

Hi,

I detected a strange bug in the standard function gettimeofday.
It *sometimes* reports the time which being expressed as the integer
number of milliseconds is *less* than the time obtained *earlier* with
the same function.

The expression 1000000 * tv.tv_sec + tv.tv_usec is calculated in
64-bit arithmetic, so overflow cannot happen. The negative difference
in the time values on two successive calls is about 100 milliseconds.

cygcheck.out is attached.

Andrew Makhorin
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