pgsql: Eliminate ajust scan code.

Log Message:
-----------
Eliminate ajust scan code. Since concurrent GiST it doesn't
do real work. That was missed during concurrence development.

Modified Files:
--------------
    pgsql/src/backend/access/gist:
        gist.c (r1.131 -> r1.132)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gist.c.diff?r1=1.131&r2=1.132)
        gistscan.c (r1.62 -> r1.63)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/gist/gistscan.c.diff?r1=1.62&r2=1.63)
    pgsql/src/backend/utils/resowner:
        resowner.c (r1.18 -> r1.19)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/resowner/resowner.c.diff?r1=1.18&r2=1.19)
    pgsql/src/include/access:
        gistscan.h (r1.28 -> r1.29)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/gistscan.h.diff?r1=1.28&r2=1.29)