Fix two bugs, each of which would pin LinkEmail to 17.0 #1266
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Spotted thanks to comparison test failures in #1263.
Using ICU properties in validEmailLocalPart, and an optimization in UnicodeSetProperty which assumed unassigned code points were all alike (a rather pointless optimization for a binary property), and of course the set of unassigned code points is cached at the wrong version somewhere (I was last bitten by this static cache less than a month ago: #1035 (comment)).