pgsql: Small refactoring of makeVar() from a TargetEntry

Log Message:
-----------
Small refactoring of makeVar() from a TargetEntry

Modified Files:
--------------
pgsql/src/backend/nodes:
makefuncs.c (r1.66 -> r1.67)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/nodes/makefuncs.c?r1=1.66&r2=1.67)
pgsql/src/backend/optimizer/path:
pathkeys.c (r1.101 -> r1.102)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/path/pathkeys.c?r1=1.101&r2=1.102)
pgsql/src/backend/optimizer/plan:
setrefs.c (r1.161 -> r1.162)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/setrefs.c?r1=1.161&r2=1.162)
subselect.c (r1.163 -> r1.164)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/plan/subselect.c?r1=1.163&r2=1.164)
pgsql/src/backend/optimizer/prep:
prepjointree.c (r1.73 -> r1.74)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/prep/prepjointree.c?r1=1.73&r2=1.74)
pgsql/src/backend/optimizer/util:
plancat.c (r1.163 -> r1.164)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/optimizer/util/plancat.c?r1=1.163&r2=1.164)
pgsql/src/backend/parser:
analyze.c (r1.402 -> r1.403)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/analyze.c?r1=1.402&r2=1.403)
pgsql/src/include/nodes:
makefuncs.h (r1.70 -> r1.71)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/nodes/makefuncs.h?r1=1.70&r2=1.71)