Merge gbichot@bk-internal.mysql.com:/home/bk/mysql-4.0

into mysql.com:/home/mysql_src/mysql-4.0

sql/slave.cc

@@ -1017,11 +1017,12 @@ static int check_master_version(MYSQL* mysql, MASTER_INFO* mi)
       BINLOG_FORMAT_323_GEQ_57 ;
     break;
   case '4':
-  case '5':
     mi->old_format = BINLOG_FORMAT_CURRENT;
     break;
   default:
-    errmsg = "Master reported unrecognized MySQL version";
+    /* 5.0 is not supported */
+    errmsg = "Master reported an unrecognized MySQL version. Note that 4.0 \
+slaves can't replicate a 5.0 or newer master.";
     break;
   }