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/tools/misc/poweralertd/default.nix

@@ -0,0 +1,42 @@
+{ lib, stdenv, fetchFromSourcehut, meson, ninja, pkg-config, scdoc, systemd }:
+
+stdenv.mkDerivation rec {
+  pname = "poweralertd";
+  version = "0.2.0";
+
+  outputs = [ "out" "man" ];
+
+  src = fetchFromSourcehut {
+    owner = "~kennylevinsen";
+    repo = "poweralertd";
+    rev = version;
+    sha256 = "19rw9q4pcqw56nmzjfglfikzx5wwjl4n08awwdhg0jy1k0bm3dvp";
+  };
+
+  patchPhase = ''
+    substituteInPlace meson.build --replace "systemd.get_pkgconfig_variable('systemduserunitdir')" "'${placeholder "out"}/lib/systemd/user'"
+  '';
+
+  buildInputs = [
+    systemd
+  ];
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    pkg-config
+  ];
+
+  depsBuildBuild = [
+    scdoc
+    pkg-config
+  ];
+
+  meta = with lib; {
+    description = "UPower-powered power alerter";
+    homepage = "https://git.sr.ht/~kennylevinsen/poweralertd";
+    license = licenses.gpl3Only;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ thibautmarty ];
+  };
+}