[jdk8u] RFR: 8304053: Revert os specific stubs for SystemMetrics [v3]

[Andrew John Hughes]

On Tue, 14 Mar 2023 16:16:36 GMT, Adam Farley <afarley at openjdk.org> wrote:

>> This change excludes the duplicated class SystemMetrics, and ensures we use the platform-specific version of the SystemMetrics class instead.
>
> Adam Farley has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Removing unix SystemMetrics stub class as well
>   
>   We shouldn't need it, as jdk8u uses the solaris stub class in the
>   same way as it should have used the unix stub class.
>   
>   Signed-off-by: Adam Farley <adfarley at redhat.com>

Looks good to me, with Severin's suggested change.

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Marked as reviewed by andrew (Reviewer).

PR: https://git.openjdk.org/jdk8u/pull/40