message: Fix compile issue with REALM_ENABLE_MEMDEBUG=ON
diff: #include <realm/node.hpp>
  #include <realm/utilities.hpp>
  +#if REALM_ENABLE_MEMDEBUG
  +#include <cstring>
  +#endif
  +
  using namespace realm;
  MemRef Node::create_node(size_t size, Allocator& alloc, bool context_flag, Type type, WidthType width_type, int width)
  