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/helm/default.nix

@@ -0,0 +1,74 @@
+{ lib, stdenv
+, fetchFromGitHub
+, fetchpatch
+, xorg
+, freetype
+, alsa-lib
+, curl
+, libjack2
+, lv2
+, pkg-config
+, libGLU
+, libGL
+}:
+
+  stdenv.mkDerivation {
+  version = "0.9.0";
+  pname = "helm";
+
+  src = fetchFromGitHub {
+    owner = "mtytel";
+    repo = "helm";
+    rev = "927d2ed27f71a735c3ff2a1226ce3129d1544e7e";
+    sha256 = "17ys2vvhncx9i3ydg3xwgz1d3gqv4yr5mqi7vr0i0ca6nad6x3d4";
+  };
+
+  buildInputs = [
+    xorg.libX11 xorg.libXcomposite xorg.libXcursor xorg.libXext
+    xorg.libXinerama xorg.libXrender xorg.libXrandr
+    freetype alsa-lib curl libjack2 libGLU libGL lv2
+  ];
+  nativeBuildInputs = [ pkg-config ];
+
+  CXXFLAGS = "-DHAVE_LROUND";
+  enableParallelBuilding = true;
+  makeFlags = [ "DESTDIR=$(out)" ];
+
+  patches = [
+    # gcc9 compatibility https://github.com/mtytel/helm/pull/233
+    (fetchpatch {
+      url = "https://github.com/mtytel/helm/commit/cb611a80bd5a36d31bfc31212ebbf79aa86c6f08.patch";
+      sha256 = "1i2289srcfz17c3zzab6f51aznzdj62kk53l4afr32bkjh9s4ixk";
+    })
+  ];
+
+  prePatch = ''
+    sed -i 's|usr/||g' Makefile
+    sed -i "s|/usr/share/|$out/share/|" src/common/load_save.cpp
+  '';
+
+  meta = with lib; {
+    homepage = "http://tytel.org/helm";
+    description = "A free, cross-platform, polyphonic synthesizer";
+    longDescription = ''
+      A free, cross-platform, polyphonic synthesizer.
+      Features:
+        32 voice polyphony
+        Interactive visual interface
+        Powerful modulation system with live visual feedback
+        Dual oscillators with cross modulation and up to 15 oscillators each
+        Unison and Harmony mode for oscillators
+        Oscillator feedback and saturation for waveshaping
+        12 different waveforms
+        7 filter types with keytracking
+        2 monophonic and 1 polyphonic LFO
+        Step sequencer
+        Lots of modulation sources including polyphonic aftertouch
+        Simple arpeggiator
+        Effects: Formant filter, stutter, delay
+    '';
+    license = lib.licenses.gpl3Plus;
+    maintainers = [ maintainers.magnetophon ];
+    platforms = platforms.linux;
+  };
+}