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/libass/default.nix

@@ -0,0 +1,44 @@
+{ lib, stdenv, fetchurl, pkg-config, yasm
+, freetype, fribidi, harfbuzz
+, fontconfigSupport ? true, fontconfig ? null # fontconfig support
+, rasterizerSupport ? false # Internal rasterizer
+, largeTilesSupport ? false # Use larger tiles in the rasterizer
+, libiconv
+}:
+
+assert fontconfigSupport -> fontconfig != null;
+
+let
+  mkFlag = optSet: flag: if optSet then "--enable-${flag}" else "--disable-${flag}";
+in
+
+with lib;
+stdenv.mkDerivation rec {
+  pname = "libass";
+  version = "0.15.2";
+
+  src = fetchurl {
+    url = "https://github.com/libass/libass/releases/download/${version}/${pname}-${version}.tar.xz";
+    sha256 = "sha256-G+LfnESFpX14uxjAqO0Ve8h6Wo3UjGYZYcYlyxEoMv0=";
+  };
+
+  configureFlags = [
+    (mkFlag fontconfigSupport "fontconfig")
+    (mkFlag rasterizerSupport "rasterizer")
+    (mkFlag largeTilesSupport "large-tiles")
+  ];
+
+  nativeBuildInputs = [ pkg-config yasm ];
+
+  buildInputs = [ freetype fribidi harfbuzz ]
+    ++ optional fontconfigSupport fontconfig
+    ++ optional stdenv.isDarwin libiconv;
+
+  meta = {
+    description = "Portable ASS/SSA subtitle renderer";
+    homepage    = "https://github.com/libass/libass";
+    license     = licenses.isc;
+    platforms   = platforms.unix;
+    maintainers = with maintainers; [ codyopel ];
+  };
+}