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/python-modules/seccomp/default.nix

@@ -0,0 +1,29 @@
+{ buildPythonPackage, lib
+, cython, libseccomp
+}:
+
+buildPythonPackage rec {
+  pname   = "libseccomp";
+  version = libseccomp.version;
+  src     = libseccomp.pythonsrc;
+
+  VERSION_RELEASE = version; # used by build system
+
+  nativeBuildInputs = [ cython ];
+  buildInputs = [ libseccomp ];
+
+  unpackCmd = "tar xf $curSrc";
+  doInstallCheck = true;
+
+  postPatch = ''
+    substituteInPlace ./setup.py \
+      --replace 'extra_objects=["../.libs/libseccomp.a"]' \
+                'libraries=["seccomp"]'
+  '';
+
+  meta = with lib; {
+    description = "Python bindings for libseccomp";
+    license     = with licenses; [ lgpl21 ];
+    maintainers = with maintainers; [ thoughtpolice ];
+  };
+}