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/libff/default.nix

@@ -0,0 +1,35 @@
+{ lib, stdenv, fetchFromGitHub, cmake, boost, gmp, openssl, pkg-config }:
+
+stdenv.mkDerivation rec {
+  pname = "libff";
+  version = "0.2.1";
+
+  src = fetchFromGitHub {
+    owner = "scipr-lab";
+    repo = "libff";
+    rev = "v${version}";
+    sha256 = "0dczi829497vqlmn6n4fgi89bc2h9f13gx30av5z2h6ikik7crgn";
+    fetchSubmodules = true;
+  };
+
+  cmakeFlags = [ "-DWITH_PROCPS=Off" ]
+    ++ lib.optional stdenv.isAarch64 [ "-DCURVE=ALT_BN128" "-DUSE_ASM=OFF" ];
+
+  # CMake is hardcoded to always build static library which causes linker
+  # failure for Haskell applications depending on haskellPackages.hevm on macOS.
+  postPatch = lib.optionalString stdenv.isDarwin ''
+    substituteInPlace libff/CMakeLists.txt --replace "STATIC" "SHARED"
+  '';
+
+  nativeBuildInputs = [ cmake pkg-config ];
+  buildInputs = [ boost gmp openssl ];
+
+  meta = with lib; {
+    description = "C++ library for Finite Fields and Elliptic Curves";
+    changelog = "https://github.com/scipr-lab/libff/blob/develop/CHANGELOG.md";
+    homepage = "https://github.com/scipr-lab/libff";
+    license = licenses.mit;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ arturcygan ];
+  };
+}