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/yggdrasil/change-runtime-dir.patch

@@ -0,0 +1,12 @@
+diff -ruN a/src/defaults/defaults_linux.go b/src/defaults/defaults_linux.go
+--- a/src/defaults/defaults_linux.go	2019-06-17 10:23:09.495613784 -0700
++++ b/src/defaults/defaults_linux.go	2019-07-01 10:17:11.295669440 -0700
+@@ -7,7 +7,7 @@
+ func GetDefaults() platformDefaultParameters {
+ 	return platformDefaultParameters{
+ 		// Admin
+-		DefaultAdminListen: "unix:///var/run/yggdrasil.sock",
++		DefaultAdminListen: "unix:///var/run/yggdrasil/yggdrasil.sock",
+ 
+ 		// Configuration (used for yggdrasilctl)
+ 		DefaultConfigFile: "/etc/yggdrasil.conf",

pkgs/tools/networking/yggdrasil/default.nix

@@ -0,0 +1,38 @@
+{ lib, buildGoModule, fetchFromGitHub, nixosTests }:
+
+buildGoModule rec {
+  pname = "yggdrasil";
+  version = "0.4.3";
+
+  src = fetchFromGitHub {
+    owner = "yggdrasil-network";
+    repo = "yggdrasil-go";
+    rev = "v${version}";
+    sha256 = "sha256-dI+KJblSvsBC3CrUzjaDsIZ6N2QEXRTXRbEXolBK5ko=";
+  };
+
+  vendorSha256 = "sha256-yhPArisADhP5Uop4zZVbqED76uWeBZJlV6IkKbL4EFI=";
+
+  # Change the default location of the management socket on Linux
+  # systems so that the yggdrasil system service unit does not have to
+  # be granted write permission to /run.
+  patches = [ ./change-runtime-dir.patch ];
+
+  subPackages = [ "cmd/genkeys" "cmd/yggdrasil" "cmd/yggdrasilctl" ];
+
+  ldflags = [
+    "-X github.com/yggdrasil-network/yggdrasil-go/src/version.buildVersion=${version}"
+    "-X github.com/yggdrasil-network/yggdrasil-go/src/version.buildName=${pname}"
+    "-s" "-w"
+  ];
+
+  passthru.tests.basic = nixosTests.yggdrasil;
+
+  meta = with lib; {
+    description =
+      "An experiment in scalable routing as an encrypted IPv6 overlay network";
+    homepage = "https://yggdrasil-network.github.io/";
+    license = licenses.lgpl3;
+    maintainers = with maintainers; [ bbigras ehmry gazally lassulus ];
+  };
+}