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Starting in ICU 54, collation customization attributes can be specified in the locale string, for example "@colStrength=primary;colCaseLevel=yes". Add support for this for older ICU versions as well, by adding some minimal parsing of the attributes in the locale string and calling ucol_setAttribute() on them. This is essentially what never ICU versions do internally in ucol_open(). This was we can offer this functionality in a consistent way in all ICU versions supported by PostgreSQL. Also add some tests for ICU collation customization. Reported-by: Daniel Verite <daniel@manitou-mail.org> Discussion: https://www.postgresql.org/message-id/0270ebd4-f67c-8774-1a5a-91adfb9bb41f@2ndquadrant.com