Use GMT timezone in SSL certs (#1396)

[Peter (pir)]

Pull #1337 doesn't fix it doing two conversions into time_t and doesn't do
the correct conversion of time_t in the right timezone (it should be using
timegm() not mktime()) so I believe calculations can be incorrect for hosts
in other timezones.

Basically I don't think it is the right fix.

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Reply to this email on GitHub:
https://github.com/monitoring-plugins/monitoring-plugins/pull/1396#issuecomment-162597546
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