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/applications/video/mirakurun/update.nix

@@ -0,0 +1,51 @@
+{ pname
+, version
+, homepage
+, lib
+, gitUpdater
+, writers
+, jq
+, yarn
+, yarn2nix
+}:
+
+let
+  updater = gitUpdater {
+    inherit pname version;
+    attrPath = lib.toLower pname;
+
+    # exclude prerelease versions
+    ignoredVersions = "-";
+  };
+  updateScript = builtins.elemAt updater 0;
+  updateArgs = map (lib.escapeShellArg) (builtins.tail updater);
+in writers.writeBash "update-mirakurun" ''
+  set -euxo pipefail
+
+  WORKDIR="$(mktemp -d)"
+  cleanup() {
+    rm -rf "$WORKDIR"
+  }
+  trap cleanup EXIT
+
+  # bump the version
+  ${updateScript} ${lib.concatStringsSep " " updateArgs}
+
+  # Get the path to the latest source. Note that we can't just pass the value
+  # of mirakurun.src directly because it'd be evaluated before we can run
+  # updateScript.
+  SRC="$(nix-build "${toString ../../../..}" --no-out-link -A mirakurun.src)"
+  if [[ "${version}" == "$(${jq}/bin/jq -r .version "$SRC/package.json")" ]]; then
+    echo "[INFO] Already using the latest version of ${pname}" >&2
+    exit
+  fi
+
+  cd "$WORKDIR"
+
+  cp "$SRC/package.json" package.json
+  "${yarn}/bin/yarn" install --ignore-scripts
+
+  "${yarn2nix}/bin/yarn2nix" > "${toString ./.}/yarn.nix"
+  cp yarn.lock "${toString ./.}/yarn.lock"
+  cp package.json "${toString ./.}/package.json"
+''