pgsql: Update MinGW so it handles fseeko() similar to Unix.

Log Message:
-----------
Update MinGW so it handles fseeko() similar to Unix.

Modified Files:
--------------
    pgsql:
        configure (r1.623 -> r1.624)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure?r1=1.623&r2=1.624)
        configure.in (r1.582 -> r1.583)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/configure.in?r1=1.582&r2=1.583)
    pgsql/src/bin/pg_dump:
        pg_dump.h (r1.145 -> r1.146)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_dump/pg_dump.h?r1=1.145&r2=1.146)
    pgsql/src/include:
        port.h (r1.123 -> r1.124)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/port.h?r1=1.123&r2=1.124)
    pgsql/src/include/port:
        win32.h (r1.84 -> r1.85)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/port/win32.h?r1=1.84&r2=1.85)