$NetBSD: patch-ah,v 1.4 2022/04/24 10:57:28 tnn Exp $

Handle png.

--- imgsav_dlg.c.orig	Mon Sep  6 15:07:29 1999
+++ imgsav_dlg.c
@@ -69,6 +69,7 @@ static Pixmap Select_pixmap   = None,
 
 static TV_IFILEFMT_ITEM_DEF Fmtitem_def[] = {
     { TV_STILL_FMT_TIFF   ,  "tiff", "tiffCmd" },
+    { TV_STILL_FMT_PNG    ,  "png",  "pngCmd" },
     { TV_STILL_FMT_PPM    ,  "ppm" , "ppmCmd"  }
 };