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/applications/networking/vnstat/default.nix

@@ -0,0 +1,45 @@
+{ lib, stdenv
+, fetchFromGitHub
+, pkg-config
+, gd, ncurses
+, sqlite
+, check
+}:
+
+stdenv.mkDerivation rec {
+  pname = "vnstat";
+  version = "2.9";
+
+  src = fetchFromGitHub {
+    owner = "vergoh";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-AEpq3Pn/WUiPDxYk6WKb1Uur5tD+OBfFAzLUDWnZH/0=";
+  };
+
+  postPatch = ''
+    substituteInPlace src/cfg.c --replace /usr/local $out
+  '';
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [ gd ncurses sqlite ];
+
+  checkInputs = [ check ];
+
+  doCheck = true;
+
+  meta = with lib; {
+    description = "Console-based network statistics utility for Linux";
+    longDescription = ''
+      vnStat is a console-based network traffic monitor for Linux and BSD that
+      keeps a log of network traffic for the selected interface(s). It uses the
+      network interface statistics provided by the kernel as information source.
+      This means that vnStat won't actually be sniffing any traffic and also
+      ensures light use of system resources.
+    '';
+    homepage = "https://humdi.net/vnstat/";
+    license = licenses.gpl2Plus;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ evils ];
+  };
+}