Support the new Japanese era name
* admin/unidata/NormalizationTest.txt: * admin/unidata/UnicodeData.txt: Add U+32FF SQUARE ERA NAME REIWA. Do not merge to master. * test/lisp/international/ucs-normalize-tests.el (ucs-normalize-tests--failing-lines-part1) (ucs-normalize-tests--failing-lines-part2): Update. Do not merge to master. * etc/NEWS: Mention the change.