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/emulators/gxemul/default.nix

@@ -0,0 +1,47 @@
+{ lib
+, stdenv
+, fetchurl
+, libX11
+}:
+
+stdenv.mkDerivation rec {
+  pname = "gxemul";
+  version = "0.7.0";
+
+  src = fetchurl {
+    url = "http://gavare.se/gxemul/src/${pname}-${version}.tar.gz";
+    sha256 = "sha256-ecRDfG+MqQT0bTOsNgYqZf3PSpKiSEeOQIqxEpXPjoM=";
+  };
+
+  buildInputs = [
+    libX11
+  ];
+
+  patches = [
+    # Fix compilation; remove when next release arrives
+    ./0001-fix-attributes.patch
+  ];
+
+  dontAddPrefix = true;
+
+  preConfigure = ''
+    export PREFIX=${placeholder "out"}
+  '';
+
+  meta = with lib; {
+    homepage = "http://gavare.se/gxemul/";
+    description = "Gavare's experimental emulator";
+    longDescription = ''
+      GXemul is a framework for full-system computer architecture
+      emulation. Several real machines have been implemented within the
+      framework, consisting of processors (ARM, MIPS, Motorola 88K, PowerPC, and
+      SuperH) and surrounding hardware components such as framebuffers,
+      interrupt controllers, busses, disk controllers, and serial
+      controllers. The emulation is working well enough to allow several
+      unmodified "guest" operating systems to run.
+    '';
+    license = licenses.bsd3;
+    maintainers = with maintainers; [ AndersonTorres ];
+    platforms = platforms.unix;
+  };
+}