Add missing `-strict-style` check

src/check_expr.cpp

@@ -2247,6 +2247,10 @@ gb_internal bool check_is_not_addressable(CheckerContext *c, Operand *o) {
 }
 
 gb_internal void check_old_for_or_switch_value_usage(Ast *expr) {
+	if (!build_context.strict_style) {
+		return;
+	}
+
 	Entity *e = entity_of_node(expr);
 	if (e != nullptr && (e->flags & EntityFlag_OldForOrSwitchValue) != 0) {
 		GB_ASSERT(e->kind == Entity_Variable);