build fix for png-1.5

Hi!

png-1.5 hid structure members from public view and stopped including
zlib.h automatically. dvdauthor-0.6.18 doesn't compile against that
version; I also checked git master and it still has the same issues.

The attached patch against version 0.6.18 fixes the problem.

Please include (something like) this in the next release.

Thanks,
 Thomas

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$NetBSD: patch-ab,v 1.3 2011/01/14 10:57:50 wiz Exp $

Fix build with png-1.5.

--- src/spuunmux.c.orig	2010-03-05 06:37:06.000000000 +0000
+++ src/spuunmux.c
@@ -38,6 +38,7 @@
 #include <netinet/in.h>
 
 #include <png.h>
+#include <zlib.h>
 
 #include "rgb.h"
 #include "common.h"
@@ -483,7 +484,7 @@ static int write_png(char *file_name,str
     return -1;
     }
 
-    if (setjmp(png_ptr->jmpbuf)) {
+    if (setjmp(png_jmpbuf(png_ptr))) {
     png_destroy_write_struct(&png_ptr, &info_ptr);
     fclose(fp);
     return -1;