warning C4743: 'const caffe::MemoryDataLayer<float>:: 'vftable' has different size

Hello,

I encounter this warning when using Caffe in another existing project, C++, visual studio 2015.
Because of this warning, I got two errors of
```
C22: Warning treated as error - no 'executable' file generated
LNK1257 code generation failed
```
Do you have any idea how to fix it?

Thank you in advance!

Note: I have tried to comment out memory_data_layer and my project compiled successfully.
However, I do need that layer for testing the network with memory data.