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cc1: Accept casts in sizeof expressions

Casts can be used in sizeof expressions and it means that
we have to call to cast() instead of calling unary() in
sizeexp().

--- a/src/cmd/cc/cc1/expr.c

+++ b/src/cmd/cc/cc1/expr.c

@@ -739,8 +739,6 @@

 	return node(op, rettype, np, par);

 }

-static Node *unary(void);

-

 static Type *

 typeof(Node *np)

 {

@@ -759,6 +757,8 @@

 	return tp;

 }

+static Node *cast(void);

+

 static Type *

 sizeexp(void)

 {

@@ -771,7 +771,7 @@

 		tp = typename();

 		break;

 	default:

-		tp = typeof(unary());

+		tp = typeof(cast());

 		break;

 	}

 	expect(')');

@@ -813,8 +813,6 @@

 		}

 	}

 }

-

-static Node *cast(void);

 static Node *

 unary(void)