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/audio/munt/mt32emu-smf2wav.nix

@@ -0,0 +1,52 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, cmake
+, glib
+, libmt32emu
+, pkg-config
+}:
+
+let
+  char2underscore = char: str: lib.replaceChars [ char ] [ "_" ] str;
+in
+stdenv.mkDerivation rec {
+  pname = "mt32emu-smf2wav";
+  version = "1.8.2";
+
+  src = fetchFromGitHub {
+    owner = "munt";
+    repo = "munt";
+    rev = "${char2underscore "-" pname}_${char2underscore "." version}";
+    sha256 = "1dh5xpnsgx367ch45mm5c2p26vnxf3shax2afg2cd2lrbrlii7l9";
+  };
+
+  postPatch = ''
+    sed -i -e '/add_subdirectory(mt32emu)/d' CMakeLists.txt
+  '';
+
+  dontFixCmake = true;
+
+  nativeBuildInputs = [
+    cmake
+    pkg-config
+  ];
+
+  buildInputs = [
+    libmt32emu
+    glib
+  ];
+
+  cmakeFlags = [
+    "-Dmunt_WITH_MT32EMU_QT=OFF"
+    "-Dmunt_WITH_MT32EMU_SMF2WAV=ON"
+  ];
+
+  meta = with lib; {
+    homepage = "http://munt.sourceforge.net/";
+    description = "Produces a WAVE file from a Standard MIDI file (SMF)";
+    license = with licenses; [ gpl3Plus ];
+    maintainers = with maintainers; [ OPNA2608 ];
+    platforms = platforms.all;
+  };
+}