$OpenBSD: patch-xwin_c,v 1.1 2011/07/08 20:38:01 naddy Exp $

Fix build with png-1.5.

--- xwin.c.orig	Wed Jul  6 15:44:07 2011
+++ xwin.c	Wed Jul  6 15:44:25 2011
@@ -277,7 +277,7 @@ int write_png(int which,const char *filename)
       fclose(f);
       return 1;
    }
-   if (setjmp(pp->jmpbuf)) {
+   if (setjmp(png_jmpbuf(pp))) {
       png_destroy_write_struct(&pp,&ip);
       fclose(f);
       gdk_image_destroy(image);