pgsql: Prohibit creating ICU collation with different ctype

Prohibit creating ICU collation with different ctype

ICU does not support "collate" and "ctype" being different, so the
collctype catalog column is ignored. But for catalog neatness, ensure
that they are the same.

Branch
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master

Details
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https://git.postgresql.org/pg/commitdiff/13a57710dbafad26669833add0ae6ae60314f8dc

Modified Files
--------------
src/backend/utils/adt/pg_locale.c | 5 +++++
1 file changed, 5 insertions(+)

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