RFR: 8313312: Add missing classpath exception copyright header [v2]

[Roger Riggs]

On Fri, 28 Jul 2023 17:39:18 GMT, Amit Kumar <amitkumar at openjdk.org> wrote:

>> Adds `classpath exception` in multiple files, affects copyright header only.
>
> Amit Kumar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   revert java.lang.foreign changes

The changes in jdk.internal.util classes look ok.

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PR Review: https://git.openjdk.org/jdk/pull/15070#pullrequestreview-1559281414