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Avoid error() in cpp directives

Error() tries to recover from error and this is something
you don't want in a directive preprocessor.

--- a/cc1/cpp.c

+++ b/cc1/cpp.c

@@ -329,8 +329,10 @@

 	setnamespace(NS_CPP);

 	next();

-	if (yytoken != IDEN)

-		error("macro names must be identifiers");

+	if (yytoken != IDEN) {

+		cpperror("macro names must be identifiers");

+		return;

+	}

 	sym = yylval.sym;

 	if (sym->flags & ISDECLARED) {

 		warn("'%s' redefined", yytext);