Thread: pgsql: Provide a clearer error message if the pg_control version number

Log Message:
-----------
Provide a clearer error message if the pg_control version number looks
wrong because of mismatched byte ordering.

Modified Files:
--------------
    pgsql/src/backend/access/transam:
        xlog.c (r1.291 -> r1.292)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xlog.c?r1=1.291&r2=1.292)
    pgsql/src/bin/pg_controldata:
        pg_controldata.c (r1.35 -> r1.36)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/src/bin/pg_controldata/pg_controldata.c?r1=1.35&r2=1.36)