icaltimezone_get_builtin_timezone(const char *location) yields a rather
'simplified' version of the timezone pointed to by location: only the current
way of determining the timezone, without the historical exceptions - like vzic
would report it in Outlook2k-compatible mode.
It this desired behavior? It currently makes the regression tests fail,
because test 23 expects 2000-11-03 to be non-DST in LA.
In 2000, indeed DST ended the last week of october. Nowadays, however, it ends
the first week of November. Because icaltimezone_get_builtin_timezone only
returns the current procedure, 2000-11-03 is considered to be DST, and the
regression test fails.
Should icaltimezone_get_builtin_timezone return a timezone with all its
exceptions intact, or is this function designed to be suitable only for the