RFR: JDK-8348598 : Update Libpng to 1.6.47 [v3]

[Phil Race]

On Thu, 13 Mar 2025 17:30:33 GMT, Harshitha Onkar <honkar at openjdk.org> wrote:

>> Upgraded Libpng to v1.6.47
>
> Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   header update

I was surprised by how many changes there are.

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Marked as reviewed by prr (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/24021#pullrequestreview-2683217837