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Update lvalue flag in cast()

An expression after a cast is an lvalue only if the expression
before of the cast was a lvalue.

--- a/expr.c

+++ b/expr.c

@@ -225,6 +225,7 @@

 cast(void)

 {

 	Type *tp;

+	Node *np1, *np2;

 	extern Type *typename(void);

 	if (yytoken == '(') {

@@ -233,7 +234,10 @@

 			next();

 			tp = typename();

 			expect(')');

-			return castcode(cast(), tp);

+			np1 = cast();

+			np2 = castcode(np1, tp);

+			np2->b.lvalue = np1->b.lvalue;

+			return np1;

 		default:

 			break;

 		}