uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/servers/sql/postgresql/ext/pg_topn.nix

@@ -0,0 +1,32 @@
+{ lib, stdenv, fetchFromGitHub, postgresql }:
+
+stdenv.mkDerivation rec {
+  pname = "pg_topn";
+  version = "2.4.0";
+
+  buildInputs = [ postgresql ];
+
+  src = fetchFromGitHub {
+    owner  = "citusdata";
+    repo   = "postgresql-topn";
+    rev    = "refs/tags/v${version}";
+    sha256 = "1appxriw7h29kyhv3h6b338g5m2nz70q3mxasy4mjimqhbz1zyqs";
+  };
+
+  installPhase = ''
+    mkdir -p $out/{lib,share/postgresql/extension}
+
+    cp *.so      $out/lib
+    cp *.sql     $out/share/postgresql/extension
+    cp *.control $out/share/postgresql/extension
+  '';
+
+  meta = with lib; {
+    description = "Efficient querying of 'top values' for PostgreSQL";
+    homepage    = "https://github.com/citusdata/postgresql-topn";
+    changelog   = "https://github.com/citusdata/postgresql-topn/raw/v${version}/CHANGELOG.md";
+    maintainers = with maintainers; [ thoughtpolice ];
+    platforms   = postgresql.meta.platforms;
+    license     = licenses.agpl3Only;
+  };
+}