Update post-08 code for changes in x86_64 0.5.0

src/bin/test-exception-double-fault-stack-overflow.rs

@@ -65,7 +65,7 @@ pub fn init_test_idt() {
 }
 
 extern "x86-interrupt" fn double_fault_handler(
-    _stack_frame: &mut ExceptionStackFrame,
+    _stack_frame: &mut InterruptStackFrame,
     _error_code: u64,
 ) {
     serial_println!("ok");