RFR: 8324799: Use correct extension for C++ test headers [v2]

[Kim Barrett]

On Wed, 28 Feb 2024 04:06:08 GMT, Guoxiong Li <gli at openjdk.org> wrote:

>> Kim Barrett has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - add Oracle copyright
>>  - fix busted copyright text
>
> test/hotspot/jtreg/serviceability/jvmti/thread/GetStackTrace/GetStackTraceAndRetransformTest/libGetStackTraceAndRetransformTest.cpp line 27:
> 
>> 25: #include <string.h>
>> 26: #include "jvmti.h"
>> 27: #include "jvmti_common.hpp"
> 
> The oracle copyright needs to be added in this file?
> 
>>  * Copyright (c) 2023, Datadog, Inc. All rights reserved.
>>  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

We've touched this a couple times recently.  Updating.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18035#discussion_r1506814342