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>

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)
  */