[jdk17u-dev] RFR: 8348598: Update Libpng to 1.6.47

[Matthias Baesken]

On Mon, 31 Mar 2025 15:08:27 GMT, Goetz Lindenmaier <goetz at openjdk.org> wrote:

> I had to resolve the makefile.
> The same file is edited as in 21, but the
> coding looks different in 17.
> It differs to head as the make code is in an other file.

what happened to 
DISABLED_WARNINGS_gcc_png.c := maybe-uninitialized unused-function,

from head/24 is that needed ?

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PR Review: https://git.openjdk.org/jdk17u-dev/pull/3414#pullrequestreview-2731759906