fix an error when run ``` make make matlab make clean make ``` All previous commands end with success, while at the last `make`, a long list of error would print out and denseGpuKernels.cu gets deleted
fix an error when run
```
make
make matlab
make clean
make
```
All previous commands end with success, while at the last `make`, a long list of error would print out and denseGpuKernels.cu gets deleted

peterwittek/somoclu,peterwittek/somoclu,peterwittek/somoclu,peterwittek/somoclu,peterwittek/somoclu,peterwittek/somoclu