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/networking/instant-messengers/element/seshat/update.sh

@@ -0,0 +1,49 @@
+#!/usr/bin/env nix-shell
+#!nix-shell -I nixpkgs=../../../../../../ -i bash -p wget prefetch-yarn-deps yarn nix-prefetch
+
+if [ "$#" -gt 1 ] || [[ "$1" == -* ]]; then
+  echo "Regenerates packaging data for the seshat package."
+  echo "Usage: $0 [git release tag]"
+  exit 1
+fi
+
+version="$1"
+
+set -euo pipefail
+
+if [ -z "$version" ]; then
+  version="$(wget -O- "https://api.github.com/repos/matrix-org/seshat/tags" | jq -r '.[] | .name' | sort --version-sort | tail -1)"
+fi
+
+SRC="https://raw.githubusercontent.com/matrix-org/seshat/$version"
+
+tmpdir=$(mktemp -d)
+trap 'rm -rf "$tmpdir"' EXIT
+
+pushd $tmpdir
+wget "$SRC/seshat-node/yarn.lock"
+yarn_hash=$(prefetch-yarn-deps yarn.lock)
+popd
+
+src_hash=$(nix-prefetch-github matrix-org seshat --rev ${version} | jq -r .sha256)
+
+cat > pin.json << EOF
+{
+  "version": "$version",
+  "srcHash": "$src_hash",
+  "yarnHash": "$yarn_hash",
+  "cargoHash": "0000000000000000000000000000000000000000000000000000"
+}
+EOF
+
+cargo_hash=$(nix-prefetch "{ sha256 }: (import ../../../../../.. {}).element-desktop.seshat.cargoDeps")
+
+cat > pin.json << EOF
+{
+  "version": "$version",
+  "srcHash": "$src_hash",
+  "yarnHash": "$yarn_hash",
+  "cargoHash": "$cargo_hash"
+}
+EOF
+