8527 tty buffer/queue sizes should be larger

@@ -71,10 +71,15 @@
 #define ARG_MAX         _ARG_MAX64      /* max length of arguments to exec */
 #else   /* _LP64 */
 #define ARG_MAX         _ARG_MAX32      /* max length of arguments to exec */
 #endif  /* _LP64 */
 
+
+/*
+ * These two symbols have their historical values, the actual buffer is
+ * larger.
+ */
 #ifndef MAX_CANON
 #define MAX_CANON       256     /* max bytes in line for canonical processing */
 #endif
 
 #ifndef MAX_INPUT