pgsql: Fix another problem in 8.2 changes that allowed "one-time" qual

Log Message:
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Fix another problem in 8.2 changes that allowed "one-time" qual conditions to
be checked at plan levels below the top; namely, we have to allow for Result
nodes inserted just above a nestloop inner indexscan. Should think about
using the general Param mechanism to pass down outer-relation variables, but
for the moment we need a back-patchable solution. Per report from Phil Frost.

Modified Files:
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pgsql/src/backend/executor:
nodeResult.c (r1.38 -> r1.39)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/executor/nodeResult.c.diff?r1=1.38&r2=1.39)
pgsql/src/backend/optimizer/plan:
setrefs.c (r1.128 -> r1.129)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/setrefs.c.diff?r1=1.128&r2=1.129)