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/tools/networking/nbd/default.nix

@@ -0,0 +1,38 @@
+{ lib, stdenv, fetchurl, pkg-config, glib, which, bison, nixosTests, linuxHeaders }:
+
+stdenv.mkDerivation rec {
+  pname = "nbd";
+  version = "3.24";
+
+  src = fetchurl {
+    url = "mirror://sourceforge/nbd/nbd-${version}.tar.xz";
+    sha256 = "sha256-aHcVbSOnsz917uidL1wskcVCr8PNy2Nt6lqIU5pY0Qw=";
+  };
+
+  buildInputs = [ glib linuxHeaders ];
+
+  nativeBuildInputs = [ pkg-config which bison ];
+
+  postInstall = ''
+    mkdir -p "$out/share/doc/nbd-${version}"
+    cp README.md "$out/share/doc/nbd-${version}/"
+  '';
+
+  doCheck = true;
+
+  passthru.tests = {
+    test = nixosTests.nbd;
+  };
+
+  # Glib calls `clock_gettime', which is in librt. Linking that library
+  # here ensures that a proper rpath is added to the executable so that
+  # it can be loaded at run-time.
+  NIX_LDFLAGS = lib.optionalString stdenv.isLinux "-lrt -lpthread";
+
+  meta = {
+    homepage = "http://nbd.sourceforge.net";
+    description = "Map arbitrary files as block devices over the network";
+    license = lib.licenses.gpl2;
+    platforms = lib.platforms.linux;
+  };
+}