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>

nixos/modules/services/misc/svnserve.nix

@@ -0,0 +1,46 @@
+# SVN server
+{ config, lib, pkgs, ... }:
+
+with lib;
+
+let
+
+  cfg = config.services.svnserve;
+
+in
+
+{
+
+  ###### interface
+
+  options = {
+
+    services.svnserve = {
+
+      enable = mkOption {
+        type = types.bool;
+        default = false;
+        description = "Whether to enable svnserve to serve Subversion repositories through the SVN protocol.";
+      };
+
+      svnBaseDir = mkOption {
+        type = types.str;
+        default = "/repos";
+        description = "Base directory from which Subversion repositories are accessed.";
+      };
+    };
+
+  };
+
+
+  ###### implementation
+
+  config = mkIf cfg.enable {
+    systemd.services.svnserve = {
+      after = [ "network.target" ];
+      wantedBy = [ "multi-user.target" ];
+      preStart = "mkdir -p ${cfg.svnBaseDir}";
+      script = "${pkgs.subversion.out}/bin/svnserve -r ${cfg.svnBaseDir} -d --foreground --pid-file=/run/svnserve.pid";
+    };
+  };
+}