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/security/scrypt/default.nix

@@ -0,0 +1,45 @@
+{ lib
+, stdenv
+, fetchurl
+, openssl
+, getconf
+, util-linux
+}:
+
+stdenv.mkDerivation rec {
+  pname = "scrypt";
+  version = "1.3.1";
+
+  src = fetchurl {
+    url = "https://www.tarsnap.com/scrypt/${pname}-${version}.tgz";
+    sha256 = "1hnl0r6pmyxiy4dmafmqk1db7wpc0x9rqpzqcwr9d2cmghcj6byz";
+  };
+
+  outputs = [ "out" "lib" "dev" ];
+
+  configureFlags = [ "--enable-libscrypt-kdf" ];
+
+  buildInputs = [ openssl ];
+
+  nativeBuildInputs = [ getconf ];
+
+  patchPhase = ''
+    for f in Makefile.in autotools/Makefile.am libcperciva/cpusupport/Build/cpusupport.sh configure ; do
+      substituteInPlace $f --replace "command -p " ""
+    done
+
+    patchShebangs tests/test_scrypt.sh
+  '';
+
+  doCheck = true;
+  checkTarget = "test";
+  checkInputs = lib.optionals stdenv.isLinux [ util-linux ];
+
+  meta = with lib; {
+    description = "Encryption utility";
+    homepage    = "https://www.tarsnap.com/scrypt.html";
+    license     = licenses.bsd2;
+    platforms   = platforms.all;
+    maintainers = with maintainers; [ thoughtpolice ];
+  };
+}