Remove python3 conditions

Author: kounelisagis

tiledb/npbuffer.cc

@@ -59,7 +59,6 @@ using namespace tiledb;
 namespace py = pybind11;
 using namespace pybind11::literals;
 
-#if PY_MAJOR_VERSION >= 3
 class NumpyConvert {
 private:
   bool use_iter_ = false;
@@ -551,24 +550,19 @@ if (PyUnicode_Check(u.ptr())) {
     return py::make_tuple(data_np, offset_np);
   }
 };
-#endif
 
 py::tuple convert_np(py::array input, bool allow_unicode,
                      bool use_fallback = false) {
-#if PY_MAJOR_VERSION >= 3
   if (use_fallback) {
-#endif
     auto tiledb = py::module::import("tiledb");
     auto libtiledb = tiledb.attr("libtiledb");
     auto array_to_buffer = libtiledb.attr("array_to_buffer");
     return array_to_buffer(input);
-#if PY_MAJOR_VERSION >= 3
   } else {
     NumpyConvert cvt(input);
     cvt.allow_unicode(allow_unicode);
     return cvt.get();
   }
-#endif
 }
 
 }; // namespace tiledbpy