update darktable, apply upstream libpng-15 patch

svn path=/nixpkgs/trunk/; revision=31458

pkgs/applications/graphics/darktable/default.nix

@@ -8,12 +8,12 @@
 assert stdenv ? glibc;
 
 stdenv.mkDerivation rec {
-  version = "0.9.1";
+  version = "0.9.3";
   name = "darktable-${version}";
 
   src = fetchurl {
     url = "mirror://sourceforge/darktable/darktable-${version}.tar.gz";
-    sha256 = "b687a5f1b2a6c8aa230c1dc3ef83bf74a103e3ebe1c61cdea95a612a7375f21e";
+    sha256 = "0al9fxifqv9vg8rj6vybjsn6f25pq5ij9367imlhpmsv6m9m5mqw";
   };
 
   buildInputs =

pkgs/applications/graphics/darktable/libpng-15.patch

@@ -0,0 +1,22 @@
+commit 5803d31ae7704e0349821dcc20a94a1cddda69f1
+Author: Tim Harder <radhermit@gmail.com>
+Date:   Wed Sep 21 14:13:55 2011 -0700
+
+    Fix build with libpng-1.5
+    
+    Explicitly include the zlib.h header for the Z_BEST_COMPRESSION and
+    Z_DEFAULT_STRATEGY macros since >=libpng-1.5 doesn't pull it in anymore
+    via the png.h header.
+
+diff --git a/src/imageio/format/png.c b/src/imageio/format/png.c
+index 40c7d48..c7be566 100644
+--- a/src/imageio/format/png.c
++++ b/src/imageio/format/png.c
+@@ -28,6 +28,7 @@
+ #include <stdio.h>
+ #include <png.h>
+ #include <inttypes.h>
++#include <zlib.h>
+ 
+ DT_MODULE(1)
+