Deprecate IMPORT keyword

IMPORT is simply useless, any symbol that isn't found in the current
file is automatically flagged as imported symbol.

Signed-off-by: Antonio Niño Díaz <antonio_nd@outlook.com>

include/asm/symbol.h

@@ -54,7 +54,6 @@ void sym_AddEqu(char *tzSym, SLONG value);
 void sym_AddSet(char *tzSym, SLONG value);
 void sym_Init(void);
 ULONG sym_GetConstantValue(char *s);
-void sym_Import(char *tzSym);
 ULONG sym_isConstant(char *s);
 struct sSymbol *sym_FindSymbol(char *tzName);
 void sym_Global(char *tzSym);

src/asm/asmy.y

@@ -772,7 +772,13 @@ import_list		:	import_list_entry
 				|	import_list_entry ',' import_list
 ;
 
-import_list_entry	:	T_ID	{ sym_Import($1); }
+import_list_entry	:	T_ID	{
+						/* This is done automatically if
+						 * the label isn't found in the
+						 * list of defined symbols. */
+						if( nPass==1 )
+							warning("IMPORT is a deprecated keyword with no effect: %s", $1);
+					}
 ;
 
 export			:	T_POP_EXPORT export_list

src/asm/symbol.c

@@ -689,24 +689,6 @@ sym_Export(char *tzSym)
 
 }
 
-/*
- * Import a symbol
- */
-void
-sym_Import(char *tzSym)
-{
-	if (nPass == 1) {
-		/* only import symbols in pass 1 */
-		struct sSymbol *nsym;
-
-		if (findsymbol(tzSym, NULL)) {
-			yyerror("'%s' already defined", tzSym);
-		}
-		if ((nsym = createsymbol(tzSym)) != NULL)
-			nsym->nType |= SYMF_IMPORT;
-	}
-}
-
 /*
  * Globalize a symbol (export if defined, import if not)
  */