git: openjdk/jdk8u-dev: 8295685: Update Libpng to 1.6.38

[Martin Balao]

Changeset: 5b76d032
Author:    Martin Balao <mbalao at openjdk.org>
Date:      2023-09-19 14:43:20 +0000
URL:       https://git.openjdk.org/jdk8u-dev/commit/5b76d03291edd805ce594972a108c305a32ac478

8295685: Update Libpng to 1.6.38

Reviewed-by: andrew
Backport-of: d183dc25f7360c3012726acf8c03874df6fc41a4

! THIRD_PARTY_README
! corba/THIRD_PARTY_README
! hotspot/THIRD_PARTY_README
! jaxp/THIRD_PARTY_README
! jaxws/THIRD_PARTY_README
! jdk/THIRD_PARTY_README
! jdk/src/share/native/sun/awt/libpng/CHANGES
! jdk/src/share/native/sun/awt/libpng/LICENSE
! jdk/src/share/native/sun/awt/libpng/README
! jdk/src/share/native/sun/awt/libpng/png.c
! jdk/src/share/native/sun/awt/libpng/png.h
! jdk/src/share/native/sun/awt/libpng/pngconf.h
! jdk/src/share/native/sun/awt/libpng/pngget.c
! jdk/src/share/native/sun/awt/libpng/pnglibconf.h
! jdk/src/share/native/sun/awt/libpng/pngpriv.h
! jdk/src/share/native/sun/awt/libpng/pngread.c
! jdk/src/share/native/sun/awt/libpng/pngrtran.c
! jdk/src/share/native/sun/awt/libpng/pngrutil.c
! jdk/src/share/native/sun/awt/libpng/pngset.c
! jdk/src/share/native/sun/awt/libpng/pngstruct.h
! langtools/THIRD_PARTY_README
! nashorn/THIRD_PARTY_README