pgsql: Update UTF-8 <--> EUC_KR, JOHAB, UHC mappings.

Log Message:
-----------
Update UTF-8 <--> EUC_KR, JOHAB, UHC mappings.
Patch contributed by Chuck McDevitt

Modified Files:
--------------
    pgsql/src/backend/utils/mb/Unicode:
        euc_kr_to_utf8.map (r1.4 -> r1.5)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/euc_kr_to_utf8.map?r1=1.4&r2=1.5)
        johab_to_utf8.map (r1.2 -> r1.3)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/johab_to_utf8.map?r1=1.2&r2=1.3)
        uhc_to_utf8.map (r1.1 -> r1.2)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/uhc_to_utf8.map?r1=1.1&r2=1.2)
        utf8_to_euc_kr.map (r1.3 -> r1.4)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_euc_kr.map?r1=1.3&r2=1.4)
        utf8_to_johab.map (r1.1 -> r1.2)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_johab.map?r1=1.1&r2=1.2)
        utf8_to_uhc.map (r1.1 -> r1.2)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/mb/Unicode/utf8_to_uhc.map?r1=1.1&r2=1.2)