refresh patches.

debian/paches/04-manpage.patch: Removed (upstream merged).

debian/patches/libpng15

@@ -23,11 +23,13 @@ Forwarded: <no|not-needed|url proving that it has been forwarded>
 Reviewed-By: <name and email of someone who approved the patch>
 Last-Update: <YYYY-MM-DD>
 
---- dvdisaster-0.72.3.orig/tools/pngio.h
-+++ dvdisaster-0.72.3/tools/pngio.h
-@@ -21,6 +21,10 @@
- #define PNGIO_H
+Index: dvdisaster/tools/pngio.h
+===================================================================
+--- dvdisaster.orig/tools/pngio.h	2012-04-08 21:51:11.671592091 +0900
++++ dvdisaster/tools/pngio.h	2012-04-08 21:51:13.799602501 +0900
+@@ -22,6 +22,10 @@
  
+ #include <zlib.h>
  #include <png.h>
 +#if PNG_LIBPNG_VER_MAJOR == 1 && PNG_LIBPNG_VER_MINOR >= 4
 +  #include <zlib.h>