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Fix labelled statements

After a label was allowed only an expression, but the C grammar
allows any statement.

--- a/cc1/stmt.c

+++ b/cc1/stmt.c

@@ -43,16 +43,14 @@

 static void

 stmtexp(Symbol *lbreak, Symbol *lcont, Caselist *lswitch)

 {

-	Node *np;

-

-	if (ahead() == ':')

+	if (accept(';'))

+		return;

+	if (ahead() == ':') {

 		label();

-

-	if (yytoken != ';') {

-		np = expr();

-		emit(OEXPR, np);

+		stmt(lbreak, lcont, lswitch);

+		return;

 	}

-

+	emit(OEXPR, expr());

 	expect(';');

 }