definition for 'MAXUPVAL' moved for a more "private" place and its

value and comment corrected to reflect current implementation

lfunc.h

@@ -1,5 +1,5 @@
 /*
-** $Id: lfunc.h,v 2.13 2014/02/18 13:39:37 roberto Exp roberto $
+** $Id: lfunc.h,v 2.14 2014/06/19 18:27:20 roberto Exp roberto $
 ** Auxiliary functions to manipulate prototypes and closures
 ** See Copyright Notice in lua.h
 */
@@ -22,6 +22,13 @@
 #define isintwups(L)	(L->twups != L)
 
 
+/*
+** maximum number of upvalues in a closure (both C and Lua). (Value
+** must fit in a VM register.)
+*/
+#define MAXUPVAL	255
+
+
 /*
 ** Upvalues for Lua closures
 */