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/keepalived/default.nix

@@ -0,0 +1,43 @@
+{ lib, stdenv, fetchFromGitHub, nixosTests
+, file, libmnl, libnftnl, libnl
+, net-snmp, openssl, pkg-config
+, autoreconfHook }:
+
+stdenv.mkDerivation rec {
+  pname = "keepalived";
+  version = "2.2.7";
+
+  src = fetchFromGitHub {
+    owner = "acassen";
+    repo = "keepalived";
+    rev = "v${version}";
+    sha256 = "sha256-erpYC4klkgvZ9D+4qM/qIHajsyOGKRbX7lhs6lfWFTQ=";
+  };
+
+  buildInputs = [
+    file
+    libmnl
+    libnftnl
+    libnl
+    net-snmp
+    openssl
+  ];
+
+  enableParallelBuilding = true;
+
+  passthru.tests.keepalived = nixosTests.keepalived;
+
+  nativeBuildInputs = [ pkg-config autoreconfHook ];
+
+  configureFlags = [
+    "--enable-sha1"
+    "--enable-snmp"
+ ];
+
+  meta = with lib; {
+    homepage = "https://keepalived.org";
+    description = "Routing software written in C";
+    license = licenses.gpl2Plus;
+    platforms = platforms.linux;
+  };
+}