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/secp256k1/default.nix

@@ -0,0 +1,47 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, autoreconfHook
+}:
+
+stdenv.mkDerivation {
+  pname = "secp256k1";
+
+  version = "unstable-2022-02-06";
+
+  src = fetchFromGitHub {
+    owner = "bitcoin-core";
+    repo = "secp256k1";
+    rev = "5dcc6f8dbdb1850570919fc9942d22f728dbc0af";
+    sha256 = "x9qG2S6tBSRseWaFIN9N2fRpY1vkv8idT3d3rfJnmaU=";
+  };
+
+  nativeBuildInputs = [ autoreconfHook ];
+
+  configureFlags = [
+    "--enable-benchmark=no"
+    "--enable-exhaustive-tests=no"
+    "--enable-experimental"
+    "--enable-module-ecdh"
+    "--enable-module-recovery"
+    "--enable-module-schnorrsig"
+    "--enable-tests=yes"
+  ];
+
+  doCheck = true;
+
+  checkPhase = "./tests";
+
+  meta = with lib; {
+    description = "Optimized C library for EC operations on curve secp256k1";
+    longDescription = ''
+      Optimized C library for EC operations on curve secp256k1. Part of
+      Bitcoin Core. This library is a work in progress and is being used
+      to research best practices. Use at your own risk.
+    '';
+    homepage = "https://github.com/bitcoin-core/secp256k1";
+    license = with licenses; [ mit ];
+    maintainers = with maintainers; [ ];
+    platforms = with platforms; all;
+  };
+}