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/audio/pulsemixer/default.nix

@@ -0,0 +1,35 @@
+{ lib, stdenv, fetchFromGitHub, python3, libpulseaudio }:
+
+stdenv.mkDerivation rec {
+  pname = "pulsemixer";
+  version = "1.5.1";
+
+  src = fetchFromGitHub {
+    owner = "GeorgeFilipkin";
+    repo = pname;
+    rev = version;
+    sha256 = "1jagx9zmz5pfsld8y2rj2kqg6ww9f6vqiawfy3vhqc49x3xx92p4";
+  };
+
+  inherit libpulseaudio;
+
+  buildInputs = [ python3 ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    install pulsemixer $out/bin/
+  '';
+
+  postFixup = ''
+    substituteInPlace "$out/bin/pulsemixer" \
+      --replace "libpulse.so.0" "$libpulseaudio/lib/libpulse.so.0"
+  '';
+
+  meta = with lib; {
+    description = "Cli and curses mixer for pulseaudio";
+    homepage = "https://github.com/GeorgeFilipkin/pulsemixer";
+    license = licenses.mit;
+    maintainers = [ maintainers.woffs ];
+    platforms = platforms.all;
+  };
+}