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/tools/networking/zs-apc-spdu-ctl/default.nix

@@ -0,0 +1,36 @@
+{ cmake
+, fetchFromGitHub
+, fping
+, lib
+, libowlevelzs
+, net-snmp
+, stdenv
+}:
+
+# TODO: add a services entry for the /etc/zs-apc-spdu.conf file
+stdenv.mkDerivation rec {
+  pname = "zs-apc-spdu-ctl";
+  version = "0.0.2";
+
+  src = fetchFromGitHub {
+    owner = "zseri";
+    repo = "zs-apc-spdu-ctl";
+    rev = "v${version}";
+    sha256 = "TMV9ETWBVeXq6tZ2e0CrvHBXoyKfOLCQurjBdf/iw/M=";
+  };
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ libowlevelzs net-snmp ];
+
+  postPatch = ''
+    substituteInPlace src/confent.cxx \
+      --replace /usr/sbin/fping "${fping}/bin/fping"
+  '';
+
+  meta = with lib; {
+    description = "APC SPDU control utility";
+    license = licenses.mit;
+    maintainers = with maintainers; [ zseri ];
+    platforms = platforms.linux;
+  };
+}