mingw-w64: Update to new upstream version 3.1.0.

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

pkgs/os-specific/windows/mingw-w64/default.nix

@@ -1,23 +1,15 @@
 {stdenv, fetchurl, binutilsCross ? null, gccCross ? null, onlyHeaders ? false}:
 
 let
-  name = "mingw-w64-2.0.3";
+  name = "mingw-w64-3.1.0";
 in
 stdenv.mkDerivation (rec {
   inherit name;
 
   src = fetchurl {
-    url = "mirror://sourceforge/mingw-w64/mingw-w64-v2.0.3.tar.gz";
-    sha256 = "043jk6z90f9pxs9kfn6ckh2vlnbgcv6yfbp5ybahrj3z58dcijp5";
+    url = "mirror://sourceforge/mingw-w64/mingw-w64-v3.1.0.tar.bz2";
+    sha256 = "1lhpw381gc59w8b1r9zzdwa9cdi2wx6qx7s6rvajapmbw7ksgrzc";
   };
-
-  # I don't know what's that $host directory about, I put the
-  # files inside include as usual.
-  postInstall = ''
-    rmdir $out/include
-    mv $out/x86_64-w64-mingw32/* $out
-    rm -R $out/x86_64-w64-mingw32
-  '';
 } //
 (if onlyHeaders then {
   name = name + "-headers";