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/embedded/xc3sprog/default.nix

@@ -0,0 +1,26 @@
+{ lib, stdenv, fetchsvn, cmake, libusb-compat-0_1, libftdi }:
+
+# The xc3sprog project doesn't seem to make proper releases, they only put out
+# prebuilt binary subversion snapshots on sourceforge.
+
+stdenv.mkDerivation rec {
+  version = "787";
+  pname = "xc3sprog";
+
+  src = fetchsvn {
+    url = "https://svn.code.sf.net/p/xc3sprog/code/trunk";
+    sha256 = "1rfhms3i7375kdlg0sdg5k52ix3xv5llj2dr30vamyg7pk74y8rx";
+    rev = version;
+  };
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ libusb-compat-0_1 libftdi ];
+
+  meta = with lib; {
+    description = "Command-line tools for programming FPGAs, microcontrollers and PROMs via JTAG";
+    homepage = "http://xc3sprog.sourceforge.net/";
+    license = licenses.gpl2Plus;
+    platforms = platforms.linux;
+    maintainers = [ maintainers.bjornfor ];
+  };
+}