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/libepc/default.nix

@@ -0,0 +1,48 @@
+{ lib, stdenv, fetchurl, pkg-config, intltool, gtk-doc, glib, avahi, gnutls, libuuid, libsoup, gtk3, gnome }:
+
+let
+  avahiWithGtk = avahi.override { gtk3Support = true; };
+in stdenv.mkDerivation rec {
+  pname = "libepc";
+  version = "0.4.6";
+
+  outputs = [ "out" "dev" "devdoc" ];
+
+  src = fetchurl {
+    url = "mirror://gnome/sources/${pname}/${lib.versions.majorMinor version}/${pname}-${version}.tar.xz";
+    sha256 = "1s3svb2slqjsrqfv50c2ymnqcijcxb5gnx6bfibwh9l5ga290n91";
+  };
+
+  nativeBuildInputs = [
+    pkg-config
+    intltool
+    gtk-doc
+  ];
+  buildInputs = [
+    glib
+    libuuid
+    gtk3
+  ];
+  propagatedBuildInputs = [
+    avahiWithGtk
+    gnutls
+    libsoup
+  ];
+
+  enableParallelBuilding = true;
+
+  passthru = {
+    updateScript = gnome.updateScript {
+      packageName = pname;
+      versionPolicy = "odd-unstable";
+    };
+  };
+
+  meta = with lib; {
+    description = "Easy Publish and Consume Library";
+    homepage = "https://wiki.gnome.org/Projects/libepc";
+    license = licenses.lgpl21Plus;
+    maintainers = teams.gnome.members;
+    platforms = platforms.linux;
+  };
+}