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/system/symlinks/default.nix

@@ -0,0 +1,29 @@
+{ fetchFromGitHub, lib, stdenv }:
+
+stdenv.mkDerivation rec {
+  pname = "symlinks";
+  version = "1.4.3";
+
+  src = fetchFromGitHub {
+    owner = "brandt";
+    repo = "symlinks";
+    rev = "v${version}";
+    sha256 = "EMWd7T/k4v1uvXe2QxhyPoQKUpKIUANE9AOwX461FgU=";
+  };
+
+  buildFlags = [ "CC=${stdenv.cc}/bin/cc" ];
+
+  installPhase = ''
+    mkdir -p $out/bin $out/share/man/man8
+    cp symlinks $out/bin
+    cp symlinks.8 $out/share/man/man8
+  '';
+
+  meta = with lib; {
+    description = "Find and remedy problematic symbolic links on a system";
+    homepage = "https://github.com/brandt/symlinks";
+    license = licenses.mit;
+    maintainers = with maintainers; [ goibhniu ckauhaus ];
+    platforms = platforms.unix;
+  };
+}