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_cron.nix

@@ -0,0 +1,32 @@
+{ lib, stdenv, fetchFromGitHub, postgresql }:
+
+stdenv.mkDerivation rec {
+  pname = "pg_cron";
+  version = "1.4.1";
+
+  buildInputs = [ postgresql ];
+
+  src = fetchFromGitHub {
+    owner  = "citusdata";
+    repo   = pname;
+    rev    = "v${version}";
+    sha256 = "1fknr7z1m24dpp4hm5s6y5phdns7yvvj88cl481wjhw8bigz6kns";
+  };
+
+  installPhase = ''
+    mkdir -p $out/{lib,share/postgresql/extension}
+
+    cp *.so      $out/lib
+    cp *.sql     $out/share/postgresql/extension
+    cp *.control $out/share/postgresql/extension
+  '';
+
+  meta = with lib; {
+    description = "Run Cron jobs through PostgreSQL";
+    homepage    = "https://github.com/citusdata/pg_cron";
+    changelog   = "https://github.com/citusdata/pg_cron/raw/v${version}/CHANGELOG.md";
+    maintainers = with maintainers; [ thoughtpolice ];
+    platforms   = postgresql.meta.platforms;
+    license     = licenses.postgresql;
+  };
+}