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/libxl/default.nix

@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchurl }:
+
+stdenv.mkDerivation rec {
+  pname = "libxl";
+  version = "3.9.4.3";
+
+  src = fetchurl {
+    url = "https://www.libxl.com/download/${pname}-lin-${version}.tar.gz";
+    sha256 = "sha256-U8hXoqBzjSGigOXc29LZQk3KrGiYvBPBJPg5qihcAsY=";
+  };
+
+  dontConfigure = true;
+  dontBuild = true;
+
+  installPhase = ''
+    mkdir $out
+    cp -rva include_c include_cpp license.txt $out/
+    cp -rva lib64 $out/lib
+  '';
+
+  meta = with lib; {
+    description = "A library for parsing Excel files";
+    homepage    = "https://www.libxl.com/";
+    license     = licenses.unfree;
+    platforms   = platforms.linux;
+    maintainers = with maintainers; [  ];
+  };
+}