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/r128gain/default.nix

@@ -0,0 +1,44 @@
+{ lib
+, fetchFromGitHub
+, gitUpdater
+, substituteAll
+, ffmpeg
+, python3Packages
+, sox
+}:
+
+python3Packages.buildPythonApplication rec {
+  pname = "r128gain";
+  version = "1.0.3";
+
+  src = fetchFromGitHub {
+    owner = "desbma";
+    repo = "r128gain";
+    rev = version;
+    sha256 = "0w2i2szajv1vcmc96w0fczdr8xc28ijcf1gdg180f21gi6yh96sc";
+  };
+
+  patches = [
+    (substituteAll {
+      src = ./ffmpeg-location.patch;
+      inherit ffmpeg;
+    })
+  ];
+
+  propagatedBuildInputs = with python3Packages; [ crcmod ffmpeg-python mutagen tqdm ];
+  checkInputs = with python3Packages; [ requests sox ];
+
+  # Testing downloads media files for testing, which requires the
+  # sandbox to be disabled.
+  doCheck = false;
+
+  passthru.updateScript = gitUpdater { inherit pname version; };
+
+  meta = with lib; {
+    description = "Fast audio loudness scanner & tagger (ReplayGain v2 / R128)";
+    homepage = "https://github.com/desbma/r128gain";
+    license = licenses.lgpl2Plus;
+    maintainers = [ maintainers.AluisioASG ];
+    platforms = platforms.all;
+  };
+}

pkgs/applications/audio/r128gain/ffmpeg-location.patch

@@ -0,0 +1,29 @@
+--- i/r128gain/__init__.py
++++ w/r128gain/__init__.py
+@@ -78,7 +78,7 @@ def get_ffmpeg_lib_versions(ffmpeg_path=None):
+   Example: 0x3040100 for FFmpeg 3.4.1
+   """
+   r = collections.OrderedDict()
+-  cmd = (ffmpeg_path or "ffmpeg", "-version")
++  cmd = (ffmpeg_path or "@ffmpeg@/bin/ffmpeg", "-version")
+   output = subprocess.run(cmd,
+                           check=True,
+                           stdout=subprocess.PIPE,
+@@ -156,7 +156,7 @@ def get_r128_loudness(audio_filepaths, *, calc_peak=True, enable_ffmpeg_threadin
+                                      os.devnull,
+                                      **additional_ffmpeg_args,
+                                      f="null").global_args("-hide_banner", "-nostats"),
+-                       cmd=ffmpeg_path or "ffmpeg")
++                       cmd=ffmpeg_path or "@ffmpeg@/bin/ffmpeg")
+ 
+   # run
+   logger().debug(cmd_to_string(cmd))
+@@ -740,7 +740,7 @@ def cl_main():
+                           help="Maximum number of tracks to scan in parallel. If not specified, autodetect CPU count")
+   arg_parser.add_argument("-f",
+                           "--ffmpeg-path",
+-                          default=shutil.which("ffmpeg"),
++                          default="@ffmpeg@/bin/ffmpeg",
+                           help="""Full file path of ffmpeg executable (only needed if not in PATH).
+                                   If not specified, autodetect""")
+   arg_parser.add_argument("-d",