no need to define 'luaP_opnames' in regular builds

lopcodes.c

@@ -1,5 +1,5 @@
 /*
-** $Id: lopcodes.c,v 1.80 2018/03/07 15:55:38 roberto Exp roberto $
+** $Id: lopcodes.c,v 1.81 2018/04/04 14:23:41 roberto Exp roberto $
 ** Opcodes for Lua virtual machine
 ** See Copyright Notice in lua.h
 */
@@ -17,6 +17,8 @@
 
 /* ORDER OP */
 
+#if defined(LUAI_DEFOPNAMES)
+
 LUAI_DDEF const char *const luaP_opnames[NUM_OPCODES+1] = {
   "MOVE",
   "LOADI",
@@ -98,6 +100,8 @@ LUAI_DDEF const char *const luaP_opnames[NUM_OPCODES+1] = {
   NULL
 };
 
+#endif
+
 
 LUAI_DDEF const lu_byte luaP_opmodes[NUM_OPCODES] = {
 /*       OT IT T  A  mode		   opcode  */