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Warn only in not used and defined symbols

Sometimes some symbols are created but they are not defined,
like for example parameters of macros or when a symbol is looked
up in the wrong namespace.

--- a/cc1/symbol.c

+++ b/cc1/symbol.c

@@ -85,8 +85,9 @@

 			break;

 		}

 		if (sym->name) {

+			short f = sym->flags;

 			htab[hash(sym->name)] = sym->hash;

-			if ((sym->flags & (ISUSED|ISGLOBAL)) == 0)

+			if ((f & (ISUSED|ISGLOBAL|ISDEFINED)) == ISDEFINED)

 				warn("'%s' defined but not used", sym->name);

 		}

 		free(sym->name);