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/rsa/default.nix

@@ -0,0 +1,36 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, unittest2
+, pyasn1
+, mock
+, isPy3k
+, pythonOlder
+}:
+
+buildPythonPackage rec {
+  pname = "rsa";
+  version = "4.8";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "5c6bd9dc7a543b7fe4304a631f8a8a3b674e2bbfc49c2ae96200cdbe55df6b17";
+  };
+
+  checkInputs = [ unittest2 mock ];
+  propagatedBuildInputs = [ pyasn1 ];
+
+  preConfigure = lib.optionalString (isPy3k && pythonOlder "3.7") ''
+    substituteInPlace setup.py --replace "open('README.md')" "open('README.md',encoding='utf-8')"
+  '';
+
+  # No tests in archive
+  doCheck = false;
+
+  meta = with lib; {
+    homepage = "https://stuvel.eu/rsa";
+    license = licenses.asl20;
+    description = "A pure-Python RSA implementation";
+  };
+
+}