[lworld] RFR: 8304084: [lworld] Fix copyright text in GensrcValueClasses.gmk

[Mandy Chung]

On Mon, 13 Mar 2023 22:16:33 GMT, Roger Riggs <rriggs at openjdk.org> wrote:

> Correct incomplete copyright.

Marked as reviewed by mchung (Committer).

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PR: https://git.openjdk.org/valhalla/pull/830