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/os-specific/linux/open-isns/default.nix

@@ -0,0 +1,30 @@
+{ lib, stdenv, openssl, fetchFromGitHub }:
+
+stdenv.mkDerivation rec {
+  pname = "open-isns";
+  version = "0.101";
+
+  src = fetchFromGitHub {
+    owner = "open-iscsi";
+    repo = "open-isns";
+    rev = "v${version}";
+    sha256 = "1g7kp1j2f8afsach6sbl4k05ybz1yz2s8yg073bv4gnv48gyxb2p";
+  };
+
+  propagatedBuildInputs = [ openssl ];
+  outputs = [ "out" "lib" ];
+  outputInclude = "lib";
+
+  configureFlags = [ "--enable-shared" ];
+
+  installFlags = [ "etcdir=$(out)/etc" "vardir=$(out)/var/lib/isns" ];
+  installTargets = [ "install" "install_hdrs" "install_lib" ];
+
+  meta = with lib; {
+    description = "iSNS server and client for Linux";
+    license = licenses.lgpl21Only;
+    homepage = "https://github.com/open-iscsi/open-isns";
+    platforms = platforms.linux;
+    maintainers = [ maintainers.markuskowa ];
+  };
+}