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/ilbc/default.nix

@@ -0,0 +1,25 @@
+{ lib, stdenv, fetchurl, gawk, cmake }:
+
+stdenv.mkDerivation rec {
+  name = "ilbc-rfc3951";
+
+  script = ./extract-cfile.awk;
+
+  rfc3951 = fetchurl {
+    url = "http://www.ietf.org/rfc/rfc3951.txt";
+    sha256 = "0zf4mvi3jzx6zjrfl2rbhl2m68pzbzpf1vbdmn7dqbfpcb67jpdy";
+  };
+
+  nativeBuildInputs = [ cmake ];
+
+  unpackPhase = ''
+    mkdir -v ${name}
+    cd ${name}
+    ${gawk}/bin/gawk -f ${script} ${rfc3951}
+    cp -v ${./CMakeLists.txt} CMakeLists.txt
+    '';
+
+  meta = {
+    platforms = lib.platforms.unix;
+  };
+}