Fix libmonit Time unit test

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Time_parse returns Unix timestamp in local time via mktime. Unfortunately the Time unit test assert against a Unix timestamp which is only valid in CET. That is, the unit test will fail if run in a different timezone. Possible solutions in recommended order

• Remove Time_parse which is not used in Monit along with other Time functions not used
• Parse in GMT via timegm which strictly speaking is more correct and safe
• Set timezone explicit (via tzset) to CET in the test

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Fix issue #50

→ <<cset 8015f091644c>>

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Removing version: 5.8.1 (automated comment)