pgsql: get_names_for_var didn't do recursion for unnamed JOIN vars quite

Log Message:
-----------
get_names_for_var didn't do recursion for unnamed JOIN vars quite right;
got it wrong when the JOIN was in an outer query level.  Per example from
Laurie Burrow.  Also fix same issue in markTargetListOrigin.  I think the
latter is only a latent bug since we currently don't apply markTargetListOrigin
except at the outer level ... but should do it right anyway.

Modified Files:
--------------
    pgsql/src/backend/parser:
        parse_target.c (r1.128 -> r1.129)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_target.c.diff?r1=1.128&r2=1.129)
    pgsql/src/backend/utils/adt:
        ruleutils.c (r1.187 -> r1.188)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/adt/ruleutils.c.diff?r1=1.187&r2=1.188)