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/fastpbkdf2/default.nix

@@ -0,0 +1,32 @@
+{ lib, stdenv, fetchFromGitHub, openssl }:
+
+stdenv.mkDerivation rec {
+  pname = "fastpbkdf2";
+  version = "1.0.0";
+
+  src = fetchFromGitHub {
+    owner = "ctz";
+    repo = "fastpbkdf2";
+    rev = "v${version}";
+    sha256 = "09ax0h4ik3vhvp3s98lic93l3g9f4v1jkr5k6z4g1lvm7s3lrha2";
+  };
+
+  buildInputs = [ openssl ];
+
+  preBuild = ''
+    makeFlagsArray=(CFLAGS="-std=c99 -O3 -g")
+  '';
+
+  installPhase = ''
+    mkdir -p $out/{lib,include/fastpbkdf2}
+    cp *.a $out/lib
+    cp fastpbkdf2.h $out/include/fastpbkdf2
+  '';
+
+  meta = with lib; {
+    description = "A fast PBKDF2-HMAC-{SHA1,SHA256,SHA512} implementation in C";
+    homepage = "https://github.com/ctz/fastpbkdf2";
+    license = licenses.cc0;
+    maintainers = with maintainers; [ ledif ];
+  };
+}