protobuf: Update to new upstream version 2.5.0.

Starting from version 32, Chromium now relies on protobuf version 2.5.0,
so let's update it, especially because it doesn't have backwards
compatible changes in the release notes.

Signed-off-by: aszlig <aszlig@redmoonstudios.org>

pkgs/development/libraries/protobuf/default.nix

@@ -1,11 +1,11 @@
 { fetchurl, stdenv, zlib }:
 
 stdenv.mkDerivation rec {
-  name = "protobuf-2.4.1";
+  name = "protobuf-2.5.0";
 
   src = fetchurl {
     url = "http://protobuf.googlecode.com/files/${name}.tar.bz2";
-    sha256 = "1gxhfhk37jyjq1z4y3d4bz4i1fk2an5ydhk5kjzlp0rhfcs5516g";
+    sha256 = "0xxn9gxhvsgzz2sgmihzf6pf75clr05mqj6218camwrwajpcbgqk";
   };
 
   buildInputs = [ zlib ];