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Use assign() to parse va_start last arg symbol

--- a/cc1/builtin.c

+++ b/cc1/builtin.c

@@ -58,21 +58,19 @@

 builtin_va_start(Symbol *sym)

 {

 	Node *np, *ap, *last;

-	Symbol **p, *lastsym;

+	Symbol **p;

 	Type *tp;

 	ap = assign();

 	expect(',');

-	if (yytoken != IDEN)

+	last = assign();

+	if (last->op != OSYM)

 		goto error;

-	lastsym = yylval.sym;

-	last = varnode(lastsym);

-	next();

-	if (!valid_va_list(ap->type) || !(lastsym->flags&SDECLARED))

+	if (!valid_va_list(ap->type) || !(last->sym->flags&SDECLARED))

 		 goto error;

-	for (p = curfun->u.pars; p && *p != lastsym; ++p)

+	for (p = curfun->u.pars; p && *p != last->sym; ++p)

 		/* nothing */;

 	if (!p || *p == NULL || p[1] == NULL || p[1]->type != ellipsistype)

 		warn("second parameter of 'va_start' not last named argument");