RFR: JDK-8329004 : Update Libpng to 1.6.43

[Phil Race]

On Thu, 25 Apr 2024 22:28:06 GMT, Harshitha Onkar <honkar at openjdk.org> wrote:

> Libpng updated from 1.6.40 to  1.6.43

src/java.desktop/share/native/libsplashscreen/libpng/png.h line 30:

> 28:  * License version 2 only, as published by the Free Software Foundation.
> 29:  * However, the following notice accompanied the original version of this
> 30:  * file and, per its terms, should not be removed:

You have lost the above 4 lines from every source file you updated.

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PR Review Comment: https://git.openjdk.org/jdk/pull/18964#discussion_r1580217289