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/dynamips/default.nix

@@ -0,0 +1,36 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, cmake
+, libelf
+, libpcap
+}:
+
+stdenv.mkDerivation rec {
+  pname = "dynamips";
+  version = "0.2.21";
+
+  src = fetchFromGitHub {
+    owner = "GNS3";
+    repo = pname;
+    rev = "v${version}";
+    hash = "sha256-JQJa3NZ9mQqqvuTzU7XmAr1WRB4zuLIwBx18OY3GbV8=";
+  };
+
+  nativeBuildInputs = [ cmake ];
+  buildInputs = [ libelf libpcap ];
+
+  cmakeFlags = [ "-DDYNAMIPS_CODE=stable" ];
+
+  meta = with lib; {
+    inherit (src.meta) homepage;
+    description = "A Cisco router emulator";
+    longDescription = ''
+      Dynamips is an emulator computer program that was written to emulate Cisco
+      routers.
+    '';
+    license = licenses.gpl2Plus;
+    platforms = platforms.linux;
+    maintainers = with maintainers; [ primeos ];
+  };
+}