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/postfixadmin/default.nix

@@ -0,0 +1,28 @@
+{ fetchFromGitHub, stdenv, lib }:
+
+stdenv.mkDerivation rec {
+  pname = "postfixadmin";
+  version = "3.3.11";
+
+  src = fetchFromGitHub {
+    owner = pname;
+    repo = pname;
+    rev = "${pname}-${version}";
+    sha256 = "sha256-jOO0AVcCmBxHLaWQOwvt7OFKAcAYPTVHTdQz1ZaYIqE=";
+  };
+
+  installPhase = ''
+    mkdir $out
+    cp -r * $out/
+    ln -sf /etc/postfixadmin/config.local.php $out/
+    ln -sf /var/cache/postfixadmin/templates_c $out/
+  '';
+
+  meta = {
+    description = "Web based virtual user administration interface for Postfix mail servers";
+    homepage = "https://postfixadmin.sourceforge.io/";
+    maintainers = with lib.maintainers; [ globin ];
+    license = lib.licenses.gpl2Plus;
+    platforms = lib.platforms.all;
+  };
+}