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

[Sergey Bylokhov]

On Thu, 13 Mar 2025 15:45:12 GMT, Harshitha Onkar <honkar at openjdk.org> wrote:

>> Harshitha Onkar has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   header update
>
> make/modules/java.desktop/lib/ClientLibraries.gmk line 249:
> 
>> 247:       DISABLED_WARNINGS_clang_dgif_lib.c := sign-compare, \
>> 248:       DISABLED_WARNINGS_clang_gzwrite.c := format-nonliteral, \
>> 249:       DISABLED_WARNINGS_clang_png.c := unused-function, \
> 
> This warning was disabled to fix the following build issue on linux and macOS.
> 
> 
> open/src/java.desktop/share/native/libsplashscreen/libpng/png.c:1558:1: error: 'png_icc_profile_error' defined but not used [-Werror=unused-function]
> [2025-03-12T23:57:44,575Z]  1558 | png_icc_profile_error(png_const_structrp png_ptr, png_const_charp name,
> [2025-03-12T23:57:44,575Z]       | ^~~~~~~~~~~~~~~~~~~~~

Might this be a bug in PNG? All usages of this function are now guarded by "PNG_READ_iCCP_SUPPORTED"? It would be useful to report this upstream.

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PR Review Comment: https://git.openjdk.org/jdk/pull/24021#discussion_r1994558215