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/graphics/drawio/headless.nix

@@ -0,0 +1,36 @@
+{ lib, writeTextFile, runtimeShell, drawio, xvfb-run }:
+
+writeTextFile {
+  name = "${drawio.pname}-headless-${drawio.version}";
+
+  executable = true;
+  destination = "/bin/drawio";
+  text = ''
+    #!${runtimeShell}
+
+    # Electron really wants a configuration directory to not die with:
+    # "Error: Failed to get 'appData' path"
+    # so we give it some temp dir as XDG_CONFIG_HOME
+    tmpdir=$(mktemp -d)
+
+    function cleanup {
+      rm -rf "$tmpdir"
+    }
+    trap cleanup EXIT
+
+    # Drawio needs to run in a virtual X session, because Electron
+    # refuses to work and dies with an unhelpful error message otherwise:
+    # "The futex facility returned an unexpected error code."
+    XDG_CONFIG_HOME="$tmpdir" ${xvfb-run}/bin/xvfb-run ${drawio}/bin/drawio $@
+  '';
+
+  meta = with lib; {
+    description = "xvfb wrapper around drawio";
+    longDescription = ''
+      A wrapper around drawio for running in headless environments.
+      Runs drawio under xvfb-run, with configuration going to a temporary
+      directory.
+    '';
+    maintainers = with maintainers; [ qyliss tfc ];
+  };
+}