libgcrypt: update from 1.5.2 to 1.5.3, potentially fixes CVE-2013-4242

pkgs/development/libraries/libgcrypt/default.nix

···
 { fetchurl, stdenv, libgpgerror }:
 
 stdenv.mkDerivation (rec {
-  name = "libgcrypt-1.5.2";
+  name = "libgcrypt-1.5.3";
 
   src = fetchurl {
     url = "mirror://gnupg/libgcrypt/${name}.tar.bz2";
-    sha256 = "0gwnzqd64cpwdmk93nll54nidsr74jpimxzj4p4z7502ylwl66p4";
+    sha256 = "1lar8y3lh61zl5flljpz540d78g99h4d5idfwrfw8lm3gm737xdw";
   };
 
   propagatedBuildInputs = [ libgpgerror ];