[devel] Bump to version 1.4.0beta103

pngerror.c

diff --git a/pngerror.c b/pngerror.c
index fb1ade3..3c9c72d 100644
--- a/pngerror.c
+++ b/pngerror.c
@@ -1,7 +1,7 @@
 
 /* pngerror.c - stub functions for i/o and memory allocation
  *
- * Last changed in libpng 1.4.0 [November 18, 2009]
+ * Last changed in libpng 1.4.0 [November 20, 2009]
  * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)