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/installer/tools/nixos-build-vms/build-vms.nix

@@ -0,0 +1,31 @@
+{ system ? builtins.currentSystem
+, config ? {}
+, networkExpr
+}:
+
+let
+  nodes = builtins.mapAttrs (vm: module: {
+    _file = "${networkExpr}@node-${vm}";
+    imports = [ module ];
+  }) (import networkExpr);
+
+  pkgs = import ../../../../.. { inherit system config; };
+
+  testing = import ../../../../lib/testing-python.nix {
+    inherit system pkgs;
+  };
+
+  interactiveDriver = (testing.makeTest { inherit nodes; testScript = "start_all(); join_all();"; }).driverInteractive;
+in
+
+
+pkgs.runCommand "nixos-build-vms" { nativeBuildInputs = [ pkgs.makeWrapper ]; } ''
+  mkdir -p $out/bin
+  ln -s ${interactiveDriver}/bin/nixos-test-driver $out/bin/nixos-test-driver
+  ln -s ${interactiveDriver}/bin/nixos-test-driver $out/bin/nixos-run-vms
+  wrapProgram $out/bin/nixos-test-driver \
+    --add-flags "--interactive"
+  wrapProgram $out/bin/nixos-run-vms \
+     --set testScript "${pkgs.writeText "start-all" "start_all(); join_all();"}" \
+     --add-flags "--no-interactive"
+''

nixos/modules/installer/tools/nixos-build-vms/nixos-build-vms.sh

@@ -0,0 +1,53 @@
+#! @runtimeShell@ -e
+# shellcheck shell=bash
+
+# Shows the usage of this command to the user
+
+showUsage() {
+    exec man nixos-build-vms
+    exit 1
+}
+
+# Parse valid argument options
+
+nixBuildArgs=()
+networkExpr=
+
+while [ $# -gt 0 ]; do
+    case "$1" in
+      --no-out-link)
+        nixBuildArgs+=("--no-out-link")
+        ;;
+      --show-trace)
+        nixBuildArgs+=("--show-trace")
+        ;;
+      -h|--help)
+        showUsage
+        exit 0
+        ;;
+      --option)
+        shift
+        nixBuildArgs+=("--option" "$1" "$2"); shift
+        ;;
+      *)
+        if [ -n "$networkExpr" ]; then
+          echo "Network expression already set!"
+          showUsage
+          exit 1
+        fi
+        networkExpr="$(readlink -f "$1")"
+        ;;
+    esac
+
+    shift
+done
+
+if [ -z "$networkExpr" ]
+then
+    echo "ERROR: A network expression must be specified!" >&2
+    exit 1
+fi
+
+# Build a network of VMs
+nix-build '<nixpkgs/nixos/modules/installer/tools/nixos-build-vms/build-vms.nix>' \
+    --argstr networkExpr "$networkExpr" "${nixBuildArgs[@]}"