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/matrix-alertmanager/update.nix

@@ -0,0 +1,32 @@
+{ lib, writeShellScript
+, coreutils, jq, common-updater-scripts
+, curl, wget, gnugrep, yarn, prefetch-yarn-deps
+}:
+
+writeShellScript "update-matrix-alertmanager" ''
+  set -xe
+  export PATH="${lib.makeBinPath [ gnugrep coreutils curl wget jq common-updater-scripts yarn prefetch-yarn-deps ]}"
+
+  cd pkgs/servers/monitoring/matrix-alertmanager/
+
+  owner="jaywink"
+  repo="matrix-alertmanager"
+  version=`curl -s "https://api.github.com/repos/$owner/$repo/tags" | jq -r .[0].name | grep -oP "^v\K.*"`
+  url="https://raw.githubusercontent.com/$owner/$repo/v$version/"
+
+  (
+    cd ../../../..
+    update-source-version matrix-alertmanager "$version" --file=pkgs/servers/monitoring/matrix-alertmanager/default.nix
+  )
+
+  rm -f package.json package-lock.json yarn.lock
+  wget "$url/package.json" "$url/package-lock.json"
+
+  yarn import
+  echo $(prefetch-yarn-deps) > yarn-hash
+
+  jq '. + { bin: .main }' package.json > package.json.tmp
+  mv package.json{.tmp,}
+
+  rm -rf package-lock.json node_modules
+''