[jdk17u-dev] RFR: 8305815: Update Libpng to 1.6.39

[Goetz Lindenmaier]

On Sat, 17 Jun 2023 09:18:04 GMT, Goetz Lindenmaier <goetz at openjdk.org> wrote:

> I backport this for parity with 17.0.9-oracle.

Pre-submit error: Build failed with:
Connection attempt failed: Connection refused
Giving up
IOException caught during compilation: Could not connect to server
I assume an infra issue.

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PR Comment: https://git.openjdk.org/jdk17u-dev/pull/1464#issuecomment-1596230976