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/mdk4/default.nix

@@ -0,0 +1,33 @@
+{ lib, stdenv, fetchFromGitHub, libnl, libpcap, pkg-config }:
+
+stdenv.mkDerivation {
+  pname = "mdk4";
+  version = "unstable-2021-04-27";
+
+  src = fetchFromGitHub {
+    owner = "aircrack-ng";
+    repo = "mdk4";
+    rev = "e94422ce8e4b8dcd132d658345814df7e63bfa41";
+    sha256 = "sha256-pZS7HQBKlSZJGqoZlSyBUzXC3osswcB56cBzgm+Sbwg=";
+  };
+
+  preBuild = ''
+    mkdir -p $out/bin
+    mkdir -p $out/share/man
+
+    substituteInPlace src/Makefile --replace '/usr/local/src/mdk4' '$out'
+  '';
+
+  nativeBuildInputs = [ pkg-config ];
+
+  buildInputs = [ libnl libpcap ];
+
+  makeFlags = [ "PREFIX=$(out)" "SBINDIR=$(PREFIX)/bin" ];
+
+  meta = with lib; {
+    description = "A tool that injects data into wireless networks";
+    homepage = "https://github.com/aircrack-ng/mdk4";
+    maintainers = with maintainers; [ fortuneteller2k ];
+    license = licenses.gpl2Plus;
+  };
+}