pgsql: ParseComplexProjection should make use of expandRecordVariable so

Log Message:
-----------
ParseComplexProjection should make use of expandRecordVariable so that
it can handle cases like (foo.x).y where foo is a subquery and x is
a function-returning-RECORD RTE in that subquery.

Modified Files:
--------------
pgsql/src/backend/parser:
parse_func.c (r1.179 -> r1.180)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_func.c.diff?r1=1.179&r2=1.180)
parse_target.c (r1.133 -> r1.134)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/parser/parse_target.c.diff?r1=1.133&r2=1.134)
pgsql/src/include/parser:
parse_target.h (r1.35 -> r1.36)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/parser/parse_target.h.diff?r1=1.35&r2=1.36)