[jdk11u] Integrated: 8372534: Update Libpng to 1.6.51

[Andrew John Hughes]

On Mon, 22 Dec 2025 18:01:46 GMT, Andrew John Hughes <andrew at openjdk.org> wrote:

> Update to the latest version of libpng. Change is a clean backport from 17u. The change built fine with GCC 8 on RHEL 8.
> 
> I'm proposing this during rampdown so the release ships with the latest version, as we also do with e.g. tzdata.

This pull request has now been integrated.

Changeset: be7966c6
Author:    Andrew John Hughes <andrew at openjdk.org>
URL:       https://git.openjdk.org/jdk11u/commit/be7966c633830516c703f14610e4fef1bbe7f57d
Stats:     636 lines in 20 files changed: 297 ins; 206 del; 133 mod

8372534: Update Libpng to 1.6.51

Backport-of: 86a5a83bef9fea1e00ba4cbc9878c02e20097bec

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PR: https://git.openjdk.org/jdk11u/pull/108