Fix 2.7 build error.

The generated Object ctor was being used in 2.7 builds.  Now that it is private (because it
shouldn't be used) we get a build error.

src/textenc.cpp

@@ -29,7 +29,7 @@ PyObject* EncodeStr(PyObject* str, const TextEnc& enc)
     else
     {
         // Encode the text with the user's encoding.
-        Object encoded = PyCodec_Encode(str, enc.name, "errors");
+        Object encoded(PyCodec_Encode(str, enc.name, "strict"));
         if (!encoded)
             return 0;