Remove unused uPREDEF flag

source/compiler/sc.h

@@ -213,7 +213,6 @@ typedef struct s_symbol {
 #define uRETVALUE   0x004 /* function returns (or should return) a value */
 #define uCONST      0x008
 #define uPROTOTYPED 0x008
-#define uPREDEF     0x008 /* constant is pre-defined */
 #define uPUBLIC     0x010
 #define uNATIVE     0x020
 #define uENUMROOT   0x020

source/compiler/sc2.c

@@ -3120,8 +3120,8 @@ SC_FUNC void delete_symbols(symbol *root,int level,int delete_labels,int delete_
         mustdelete=TRUE;
       break;
     case iCONSTEXPR:
-      /* delete constants, except predefined constants */
-      mustdelete=delete_functions || (sym->usage & uPREDEF)==0;
+      /* delete constants (predefined constants are checked later) */
+      mustdelete=TRUE;
       break;
     case iFUNCTN:
       /* optionally preserve globals (variables & functions), but