Update libpng to 1.2.38 to patch a minor security issue.
diff --git a/scripts/makefile.elf b/scripts/makefile.elf
index 6da6af5..312b696 100644
--- a/scripts/makefile.elf
+++ b/scripts/makefile.elf
@@ -2,7 +2,10 @@
# Copyright (C) 1998, 1999, 2002, 2006, 2008 Greg Roelofs
# and Glenn Randers-Pehrson
# Copyright (C) 1996, 1997 Andreas Dilger
-# 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
# Modified for Debian by Junichi Uekawa and Josselin Mouette
# Major modifications are:
@@ -13,7 +16,7 @@
# Library name:
LIBNAME = libpng12
PNGMAJ = 0
-PNGMIN = 1.2.35
+PNGMIN = 1.2.38
PNGVER = $(PNGMAJ).$(PNGMIN)
# Shared library names: