Overflow of time on FreeBSD

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FreeBSD e$B$G0J2<$N%F%9%H$,<:GT$7$^$9!#e(B

  1. Failure:
    test_at(TestTime) [/home/naruse/ruby/test/ruby/test_time.rb:177]:
    <-146138510344> expected but was
    <34667>.

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http://www.freebsd.org/cgi/query-pr.cgi?pr=145341

Ruby e$BB&$G$Ne(B workaround
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