Add MAX_STATUENAME_RANK sysconf setting

MAX_STATUENAME_RANK tells how many score file entries to use
for random statue names.

include/sys.h

@@ -22,6 +22,7 @@ struct sysopt {
 	int pers_is_uid;
 	int entrymax;
 	int pointsmin;
+	int tt_oname_maxrank;
 #ifdef PANICTRACE
 		/* panic options */
 	char *gdbpath;