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/security/cfssl/default.nix

@@ -0,0 +1,48 @@
+{ lib, buildGoModule, fetchFromGitHub, go-rice }:
+
+buildGoModule rec {
+  pname = "cfssl";
+  version = "1.6.1";
+
+  src = fetchFromGitHub {
+    owner = "cloudflare";
+    repo = "cfssl";
+    rev = "v${version}";
+    sha256 = "sha256-QY04MecjQTmrkPkWcLkXJWErtaw7esb6GnPIKGTJL34=";
+  };
+
+  subPackages = [
+    "cmd/cfssl"
+    "cmd/cfssljson"
+    "cmd/cfssl-bundle"
+    "cmd/cfssl-certinfo"
+    "cmd/cfssl-newkey"
+    "cmd/cfssl-scan"
+    "cmd/multirootca"
+    "cmd/mkbundle"
+  ];
+
+  vendorSha256 = null;
+
+  doCheck = false;
+
+  nativeBuildInputs = [ go-rice ];
+
+  preBuild = ''
+    pushd cli/serve
+    rice embed-go
+    popd
+  '';
+
+  ldflags = [
+    "-s" "-w"
+    "-X github.com/cloudflare/cfssl/cli/version.version=v${version}"
+  ];
+
+  meta = with lib; {
+    homepage = "https://cfssl.org/";
+    description = "Cloudflare's PKI and TLS toolkit";
+    license = licenses.bsd2;
+    maintainers = with maintainers; [ mbrgm ];
+  };
+}