maintainer-feedback requested: [Bug 236325] devel/icu: update to 64.1 (RC phase)

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Bug 236325: devel/icu: update to 64.1 (RC phase)
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236325



--- Description ---
Firefox 68 (scheduled on 2019-05-14) may require ICU 64.1 (scheduled on
2019-03-19). In order to continue using system ICU while also benefiting from
other changes let's prepare in advance.

See review D19479 for the patch. Each update breaks ABI, sometimes API as well.