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/applications/blockchains/fulcrum/default.nix

@@ -0,0 +1,36 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, pkg-config
+, qmake
+, python3
+, qtbase
+, rocksdb
+, zeromq
+}:
+
+stdenv.mkDerivation rec {
+  pname = "fulcrum";
+  version = "1.7.0";
+
+  src = fetchFromGitHub {
+    owner = "cculianu";
+    repo = "Fulcrum";
+    rev = "v${version}";
+    sha256 = "sha256-FIa6eAE6yyJR5UdlCXB2Gx3DqN528POxb0eYOCpVjJk=";
+  };
+
+  nativeBuildInputs = [ pkg-config qmake ];
+
+  dontWrapQtApps = true; # no GUI
+
+  buildInputs = [ python3 qtbase rocksdb zeromq ];
+
+  meta = with lib; {
+    description = "Fast & nimble SPV server for Bitcoin Cash & Bitcoin BTC";
+    homepage = "https://github.com/cculianu/Fulcrum";
+    maintainers = with maintainers; [ prusnak ];
+    license = licenses.gpl3Plus;
+    platforms = platforms.unix;
+  };
+}