Remove CDS_CXX11_TEMPLATE_ALIAS_SUPPORT macro and emulating code
Remove CDS_CXX11_EXPLICIT_CONVERSION_OPERATOR_SUPPORT macro and emulating code
Remove CDS_CXX11_VARIADIC_TEMPLATE_SUPPORT macro and emulating code
Remove CDS_CXX11_DEFAULT_FUNCTION_TEMPLATE_ARGS_SUPPORT and emilating code