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/libopus/default.nix

@@ -0,0 +1,26 @@
+{ lib, stdenv, fetchurl
+, fixedPoint ? false, withCustomModes ? true }:
+
+stdenv.mkDerivation rec {
+  pname = "libopus";
+  version = "1.3.1";
+
+  src = fetchurl {
+    url = "mirror://mozilla/opus/opus-${version}.tar.gz";
+    sha256 = "17gz8kxs4i7icsc1gj713gadiapyklynlwqlf0ai98dj4lg8xdb5";
+  };
+
+  outputs = [ "out" "dev" ];
+
+  configureFlags = lib.optional fixedPoint "--enable-fixed-point"
+                ++ lib.optional withCustomModes "--enable-custom-modes";
+
+  doCheck = !stdenv.isi686 && !stdenv.isAarch32; # test_unit_LPC_inv_pred_gain fails
+
+  meta = with lib; {
+    description = "Open, royalty-free, highly versatile audio codec";
+    license = lib.licenses.bsd3;
+    homepage = "https://www.opus-codec.org/";
+    platforms = platforms.all;
+  };
+}