pgsql: Add comments about why we set LC_CTYPE in WIN32 for time when we

Log Message:
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Add comments about why we set LC_CTYPE in WIN32 for time when we don't
actually access it, per information from Hiroshi.

Modified Files:
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pgsql/src/backend/utils/adt:
pg_locale.c (r1.55 -> r1.56)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/pg_locale.c?r1=1.55&r2=1.56)