Update libpng to 1.2.38 to patch a minor security issue.
diff --git a/scripts/makefile.mips b/scripts/makefile.mips
index f1a557d..0e7484f 100644
--- a/scripts/makefile.mips
+++ b/scripts/makefile.mips
@@ -1,7 +1,10 @@
# makefile for libpng
# Copyright (C) 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
# where make install puts libpng.a and png.h
prefix=/usr/local
@@ -76,8 +79,9 @@
pngpread.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
+
+pngtest.o: png.h pngconf.h