git: openjdk/jdk11u-dev: 8209115: adjust libsplashscreen linux ppc64le builds for easier libpng update

[Goetz Lindenmaier]

Changeset: e4fdd039
Author:    Goetz Lindenmaier <goetz at openjdk.org>
Date:      2023-01-25 08:35:17 +0000
URL:       https://git.openjdk.org/jdk11u-dev/commit/e4fdd0391733756f5b898371a66b38869d625c77

8209115: adjust libsplashscreen linux ppc64le builds for easier libpng update

Backport-of: 8044814e305c53ff22ec1831411481c4f4dc1f62

! make/lib/Awt2dLibraries.gmk
! src/java.desktop/share/native/libsplashscreen/libpng/pngpriv.h