Update libpng to 1.2.38 to patch a minor security issue.
diff --git a/scripts/makefile.sgi b/scripts/makefile.sgi
index c4b429b..d5909e5 100644
--- a/scripts/makefile.sgi
+++ b/scripts/makefile.sgi
@@ -1,12 +1,15 @@
# makefile for libpng.a and libpng12.so, SGI IRIX with 'cc'
# Copyright (C) 2001-2002, 2006, 2007 Glenn Randers-Pehrson
# Copyright (C) 1995 Guy Eric Schalnat, Group 42, Inc.
-# 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
# Library name:
LIBNAME=libpng12
PNGMAJ = 0
-PNGMIN = 1.2.35
+PNGMIN = 1.2.38
PNGVER = $(PNGMAJ).$(PNGMIN)
# Shared library names:
@@ -236,10 +239,10 @@
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