hg: jdk/sandbox: Try to fix libsplashscreen on mac.

[magnus.ihse.bursie at oracle.com]

Changeset: 0d55cbe2e63e
Author:    ihse
Date:      2018-05-04 10:55 +0200
URL:       http://hg.openjdk.java.net/jdk/sandbox/rev/0d55cbe2e63e

Try to fix libsplashscreen on mac.

! make/lib/Awt2dLibraries.gmk
- src/java.desktop/macosx/native/libsplashscreen/libpng/zlib.h
+ src/java.desktop/macosx/native/libsplashscreen/libpng/zlibwrapper/zlib.h