Update libpng to 1.2.38 to patch a minor security issue.
diff --git a/scripts/makefile.hpux b/scripts/makefile.hpux
index eaa97de..835c931 100644
--- a/scripts/makefile.hpux
+++ b/scripts/makefile.hpux
@@ -2,7 +2,10 @@
# Copyright (C) 1999-2002, 2006 Glenn Randers-Pehrson
# Copyright (C) 1995 Guy Eric Schalnat, Group 42
# contributed by Jim Rice and updated by Chris Schleicher, Hewlett Packard
-# For conditions of distribution and use, see copyright notice in png.h
+
+# This code is released under the libpng license.
+# For conditions of distribution and use, see the disclaimer
+# and license in png.h
# Where the zlib library and include files are located
ZLIBLIB=/opt/zlib/lib
@@ -18,7 +21,7 @@
# Library name:
LIBNAME = libpng12
PNGMAJ = 0
-PNGMIN = 1.2.35
+PNGMIN = 1.2.38
PNGVER = $(PNGMAJ).$(PNGMIN)
# Shared library names:
@@ -224,9 +227,10 @@
pngread.o: png.h pngconf.h
pngrtran.o: png.h pngconf.h
pngrutil.o: png.h pngconf.h
-pngtest.o: png.h pngconf.h
pngtrans.o: png.h pngconf.h
pngwrite.o: png.h pngconf.h
pngwtran.o: png.h pngconf.h
pngwutil.o: png.h pngconf.h
pngpread.o: png.h pngconf.h
+
+pngtest.o: png.h pngconf.h