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/development/libraries/gstreamer/libav/default.nix

@@ -0,0 +1,57 @@
+{ stdenv
+, lib
+, fetchurl
+, meson
+, ninja
+, pkg-config
+, python3
+, gstreamer
+, gst-plugins-base
+, gettext
+, libav
+}:
+
+# Note that since gst-libav-1.6, libav is actually ffmpeg. See
+# https://gstreamer.freedesktop.org/releases/1.6/ for more info.
+
+stdenv.mkDerivation rec {
+  pname = "gst-libav";
+  version = "1.20.1";
+
+  src = fetchurl {
+    url = "https://gstreamer.freedesktop.org/src/${pname}/${pname}-${version}.tar.xz";
+    sha256 = "1iwz7928yi48xia5kfkj54x5dfmhbj25g9125vainpmp6fv1z9wi";
+  };
+
+  outputs = [ "out" "dev" ];
+
+  nativeBuildInputs = [
+    meson
+    ninja
+    gettext
+    pkg-config
+    python3
+  ];
+
+  buildInputs = [
+    gstreamer
+    gst-plugins-base
+    libav
+  ];
+
+  mesonFlags = [
+    "-Ddoc=disabled" # `hotdoc` not packaged in nixpkgs as of writing
+  ];
+
+  postPatch = ''
+    patchShebangs \
+      scripts/extract-release-date-from-doap-file.py
+  '';
+
+  meta = with lib; {
+    description = "FFmpeg/libav plugin for GStreamer";
+    homepage = "https://gstreamer.freedesktop.org";
+    license = licenses.lgpl2Plus;
+    platforms = platforms.unix;
+  };
+}