pgsql: Remove undo information from pg_controldata --- never used.

Log Message:
-----------
Remove undo information from pg_controldata --- never used.

Florian G. Pflug

Modified Files:
--------------
    pgsql/src/backend/access/transam:
        xlog.c (r1.264 -> r1.265)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xlog.c.diff?r1=1.264&r2=1.265)
    pgsql/src/bin/pg_controldata:
        pg_controldata.c (r1.32 -> r1.33)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_controldata/pg_controldata.c.diff?r1=1.32&r2=1.33)
    pgsql/src/bin/pg_resetxlog:
        pg_resetxlog.c (r1.57 -> r1.58)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_resetxlog/pg_resetxlog.c.diff?r1=1.57&r2=1.58)
    pgsql/src/include/access:
        xlog_internal.h (r1.18 -> r1.19)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/access/xlog_internal.h.diff?r1=1.18&r2=1.19)
    pgsql/src/include/catalog:
        pg_control.h (r1.35 -> r1.36)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/include/catalog/pg_control.h.diff?r1=1.35&r2=1.36)