Bug#1084190: breakage due to tzdata System V name removal

[Rebecca N. Palmer]

I now have dateparser and pandas building (but only have the right to 
actually upload pandas).
https://salsa.debian.org/rnpalmer-guest/dateparser

And yes, that glib test failure looks like another instance of this. 
Changing g_time_zone_get_abbreviation (tz, 0) to 
g_time_zone_get_abbreviation (tz, g_time_zone_find_interval(tz, 
G_TIME_TYPE_STANDARD, 0)) (and the g_time_zone_get_abbreviation (tz, 1) 
later in the test to g_time_zone_get_abbreviation (tz, 
g_time_zone_find_interval(tz, G_TIME_TYPE_DAYLIGHT, 15000000 
/*approximately 6 months, in seconds, to get into DST*/)) would probably 
fix it, but I haven't actually tried this, and I also don't know whether 
anything user-facing is currently relying on 
g_time_zone_get_abbreviation (tz, 0).

It also raises the question of whether there might be more such packages.