rewtguy/pidgin

Add some additional tests to purple_str_to_time and address their failures.
release-2.x.y
2021-10-06, Gary Kramlich
658471e41d75
Add some additional tests to purple_str_to_time and address their failures.

Testing Done:
Ran the unit tests with all sorts of values for `TZ` and made sure they passed.

Bugs closed: PIDGIN-17552

Reviewed at https://reviews.imfreedom.org/r/931/
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