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/libsigcxx/3.0.nix

@@ -0,0 +1,42 @@
+{ stdenv
+, lib
+, fetchurl
+, pkg-config
+, meson
+, ninja
+, gnome
+}:
+
+stdenv.mkDerivation rec {
+  pname = "libsigc++";
+  version = "3.2.0";
+
+  src = fetchurl {
+    url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
+    sha256 = "jNy5huPwp8W0R0qjyDPWduYkaVCfSJkRDd8RjwQIJlE=";
+  };
+
+  nativeBuildInputs = [
+    pkg-config
+    meson
+    ninja
+  ];
+
+  doCheck = true;
+
+  passthru = {
+    updateScript = gnome.updateScript {
+      packageName = pname;
+      attrPath = "libsigcxx30";
+      versionPolicy = "odd-unstable";
+    };
+  };
+
+  meta = with lib; {
+    homepage = "https://libsigcplusplus.github.io/libsigcplusplus/";
+    description = "A typesafe callback system for standard C++";
+    license = licenses.lgpl21Plus;
+    maintainers = teams.gnome.members;
+    platforms = platforms.all;
+  };
+}