RFR: 8341722: Fix some warnings as errors when building on Linux with toolchain clang [v2]

[Matthias Baesken]

On Wed, 9 Oct 2024 11:44:35 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

>> There are a few warnings as errors occurring when building on Linux with clang (clang15). Mostly these are some kind of 'unused' warnings.
>> Might be related to https://bugs.openjdk.org/browse/JDK-8339156 .
>
> Matthias Baesken has updated the pull request incrementally with one additional commit since the last revision:
> 
>   adjust gcc warning settings; bring back rslt

Thanks for the reviews and suggestions !

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PR Comment: https://git.openjdk.org/jdk/pull/21407#issuecomment-2404260346