CPU backup for SVD fails

e.g.

Few ways to get different errors for svd:
1) sudo mv /usr/local/cuda-9.0 /usr/local/asdf # temporarily, and then run make testquick
2) CUDA_VISIBLE_DEVICES= make testquick
3) Have cuda9.1 or some other cuda when was compiled against cuda9.0 also leads to same failure. Then run make testquick.

For option #1 or #3 for svd get:
```
> lib.truncated_svd_float(
cptr(X, ctypes.c_float), cptr(Q, ctypes.c_float),
cptr(w, ctypes.c_float), cptr(U, ctypes.c_float),
param)
E AttributeError: 'NoneType' object has no attribute 'truncated_svd_float'
```

For option #2 many tests fail, so some work to do for everyone.