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/misc/libbitcoin/libbitcoin-explorer.nix

@@ -0,0 +1,39 @@
+{ lib, stdenv, fetchFromGitHub, pkg-config, autoreconfHook
+, boost, libbitcoin-client, libbitcoin-network }:
+
+let
+  pname = "libbitcoin-explorer";
+  version = "3.5.0";
+
+in stdenv.mkDerivation {
+  name = "${pname}-${version}";
+
+  src = fetchFromGitHub {
+    owner = "libbitcoin";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "033nrdzrha4kypxk4biixjsbjd16r4m2mjvpid4gdj5hzbbj1p93";
+  };
+
+  nativeBuildInputs = [ autoreconfHook pkg-config ];
+  buildInputs = [ libbitcoin-client libbitcoin-network ];
+
+  enableParallelBuilding = true;
+
+  configureFlags = [
+    "--with-tests=no"
+    "--with-boost=${boost.dev}"
+    "--with-boost-libdir=${boost.out}/lib"
+    "--with-bash-completiondir=$out/share/bash-completion/completions"
+  ];
+
+  meta = with lib; {
+    description = "Bitcoin command line tool";
+    homepage = "https://github.com/libbitcoin/libbitcoin-explorer";
+    platforms = platforms.linux ++ platforms.darwin;
+    maintainers = with maintainers; [ asymmetric ];
+
+    # AGPL with a lesser clause
+    license = licenses.agpl3;
+  };
+}