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/servers/monitoring/prometheus/smokeping-prober.nix

@@ -0,0 +1,42 @@
+{ lib, buildGoModule, fetchFromGitHub, nixosTests }:
+
+let
+  baseVersion = "0.4.2";
+  commit = "722200c4adbd6d1e5d847dfbbd9dec07aa4ca38d";
+in
+buildGoModule rec {
+  pname = "smokeping_prober";
+  version = "${baseVersion}-g${commit}";
+
+  ldflags = let
+    setVars = {
+      Version = baseVersion;
+      Revision = commit;
+      Branch = commit;
+      BuildUser = "nix";
+    };
+    varFlags = lib.concatStringsSep " " (lib.mapAttrsToList (name: value: "-X github.com/prometheus/common/version.${name}=${value}") setVars);
+  in [
+    "${varFlags}" "-s" "-w"
+  ];
+
+  src = fetchFromGitHub {
+    rev = commit;
+    owner = "SuperQ";
+    repo = "smokeping_prober";
+    sha256 = "1lpcjip6qxhalldgm6i2kgbajfqy3vwfyv9jy0jdpii13lv6mzlz";
+  };
+  vendorSha256 = "0p2jmlxpvpaqc445j39b4z4i3mnjrm25khv3sq6ylldcgfd31vz8";
+
+  doCheck = true;
+
+  passthru.tests = { inherit (nixosTests.prometheus-exporters) smokeping; };
+
+  meta = with lib; {
+    description = "Prometheus exporter for sending continual ICMP/UDP pings";
+    homepage = "https://github.com/SuperQ/smokeping_prober";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ lukegb ];
+    platforms = platforms.unix;
+  };
+}