Update ICU timezone

[classilla]

Spun off from #443. We need to get intl/icu/source/tools/tzcode/tz2icu.cpp compiled and then work off the 2017 timezone file. See https://bugzilla.mozilla.org/show_bug.cgi?id=1411957

[classilla]

Now up to 2018c. https://bugzilla.mozilla.org/show_bug.cgi?id=1430761

[roytam1]

ICU posted their own converted versions.
http://bugs.icu-project.org/trac/browser/data/trunk/tzdata/icunew/2018e/44

FYI: roytam1/mozilla45esr@d8d387c

[classilla]

Handy, thanks. That can go in FPR9.