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test: skip lj-1470 test for unconfigured timezones

`os.time()` uses `mktime()` to specify time by the given table.
`mktime()` produces the call to `tzset()` to determine the system's
timezone. If the TZ variable does not appear in the environment, the
system timezone is used. The system timezone is configured by copying,
or linking, a file in the tzfile(5) format to /etc/localtime. So, if
this file is omitted (like in RED OS), the errno is set to a non-zero
value. This leads to the nil returned by the `os.time()` for -1 time
value.

This patch skips the test if this file is missed to be sure that we
don't obtain any false positive failures due to system
misconfigurations.

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