pgsql: Fix strftime usage on Win32 when trying to fetch the locale-aware

Log Message:
-----------
Fix strftime usage on Win32 when trying to fetch the locale-aware
parts of a time string so it properly handles different encodings.

Original patch by Hiroshi Saito, heavily reworked by me and
ITAGAKI Takahiro.

Modified Files:
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    pgsql/src/backend/utils/adt:
        pg_locale.c (r1.43 -> r1.44)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/pg_locale.c?r1=1.43&r2=1.44)