Fix build with png-1.5.

x11/gnustep-gui/distinfo

@@ -1,7 +1,8 @@
-$NetBSD: distinfo,v 1.19 2009/04/13 12:19:14 rh Exp $
+$NetBSD: distinfo,v 1.20 2011/01/29 12:34:39 wiz Exp $
 
 SHA1 (gnustep-gui-0.16.0.tar.gz) = cc0a14f700a3736b8e4113d3ad80ed6f979d60be
 RMD160 (gnustep-gui-0.16.0.tar.gz) = 3083746b7bba1652d7522d5eb7e7a430b309a6f2
 Size (gnustep-gui-0.16.0.tar.gz) = 1867264 bytes
+SHA1 (patch-aa) = 6148d4fe06130d4585d4d4534182a305de9f9b70
 SHA1 (patch-ab) = 731885b48f571237414072a72a9fcc878340cf9a
 SHA1 (patch-ac) = ad486b1e2a751475c2f8bb118f8452c38273053a

x11/gnustep-gui/patches/patch-aa

@@ -0,0 +1,15 @@
+$NetBSD: patch-aa,v 1.5 2011/01/29 12:34:39 wiz Exp $
+
+Fix build with png-1.5.
+
+--- Source/NSBitmapImageRep+PNG.m.orig	2008-06-10 04:01:49.000000000 +0000
++++ Source/NSBitmapImageRep+PNG.m
+@@ -225,7 +225,7 @@ static void reader_func(png_structp png_
+     initWithBytesNoCopy: buf
+ 		 length: bytes_per_row * height];
+ 
+-  if (PNG_INFO_gAMA & png_info->valid)
++  if (png_get_valid(png_struct, png_info, PNG_INFO_gAMA))
+   {
+     double file_gamma = 2.2;
+     if (PNG_FLOATING_POINT)