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/libvarlink/default.nix

@@ -0,0 +1,43 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, meson
+, ninja
+, python3
+}:
+
+stdenv.mkDerivation rec {
+  pname = "libvarlink";
+  version = "22";
+
+  src = fetchFromGitHub {
+    owner = "varlink";
+    repo = pname;
+    rev = version;
+    sha256 = "1i15227vlc9k4276r833ndhxrcys9305pf6dga1j0alx2vj85yz2";
+  };
+
+  nativeBuildInputs = [ meson ninja ];
+
+  postPatch = ''
+    substituteInPlace varlink-wrapper.py \
+      --replace "/usr/bin/env python3" "${python3}/bin/python3"
+
+    # test-object: ../lib/test-object.c:129: main: Assertion `setlocale(LC_NUMERIC, "de_DE.UTF-8") != 0' failed.
+    # PR that added it https://github.com/varlink/libvarlink/pull/27
+    substituteInPlace lib/test-object.c \
+      --replace 'assert(setlocale(LC_NUMERIC, "de_DE.UTF-8") != 0);' ""
+
+    patchShebangs lib/test-symbols.sh
+  '';
+
+  doCheck = true;
+
+  meta = with lib; {
+    description = "C implementation of the Varlink protocol and command line tool";
+    homepage = "https://github.com/varlink/libvarlink";
+    license = licenses.asl20;
+    maintainers = with maintainers; [ artturin ];
+    platforms = platforms.linux;
+  };
+}