onnx: fix ONNX Python build (#1810)

Signed-off-by: Artur Wojcik <artur.wojcik@intel.com>

.ci/onnx/jenkins/prepare_environment.sh

@@ -68,7 +68,7 @@ function build_ngraph() {
     make install || return 1
     cd "${ngraph_directory}/ngraph/python"
     if [ ! -d ./pybind11 ]; then
-        git clone --recursive -b allow-nonconstructible-holders https://github.com/jagerman/pybind11.git
+        git clone --recursive https://github.com/pybind/pybind11.git
     fi
     export PYBIND_HEADERS_PATH="${ngraph_directory}/ngraph/python/pybind11"
     export NGRAPH_CPP_BUILD_PATH="${ngraph_directory}/ngraph_dist"

.ci/travis/ubuntu/Dockerfile

@@ -39,7 +39,7 @@ RUN make install
 
 # Prepare nGraph Python API
 WORKDIR /root/ngraph/python
-RUN git clone --recursive -b allow-nonconstructible-holders https://github.com/jagerman/pybind11.git
+RUN git clone --recursive https://github.com/pybind/pybind11.git
 ENV NGRAPH_CPP_BUILD_PATH /root/ngraph_dist
 ENV LD_LIBRARY_PATH /root/ngraph_dist/lib
 ENV PYBIND_HEADERS_PATH /root/ngraph/python/pybind11

src/ngraph/node.hpp

@@ -103,10 +103,10 @@ namespace ngraph
         void validate_and_infer_elementwise_logical();
 
         Node(const std::string& node_type, const NodeVector& arguments, size_t output_size = 1);
-        virtual ~Node();
 
         virtual void generate_adjoints(autodiff::Adjoints& adjoints, const NodeVector& deltas) {}
     public:
+        virtual ~Node();
         void revalidate_and_infer_types() { validate_and_infer_types(); }
         // Called after transition
         void delayed_validate_and_infer_types();