pgsql: Update time zone data files to tzdata release 2008c (DST law

Log Message:
-----------
Update time zone data files to tzdata release 2008c (DST law changes in
Morocco, Iraq, Choibalsan, Pakistan, Syria, Cuba, Argentina/San_Luis).

Modified Files:
--------------
    pgsql/src/timezone/data:
        africa (r1.7 -> r1.8)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/africa?r1=1.7&r2=1.8)
        asia (r1.10 -> r1.11)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/asia?r1=1.10&r2=1.11)
        backward (r1.6 -> r1.7)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/backward?r1=1.6&r2=1.7)
        northamerica (r1.10 -> r1.11)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/northamerica?r1=1.10&r2=1.11)
        southamerica (r1.10 -> r1.11)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/southamerica?r1=1.10&r2=1.11)
        zone.tab (r1.9 -> r1.10)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/timezone/data/zone.tab?r1=1.9&r2=1.10)