libcufinufft.so ends up in wrong place

[janden]

When compiling from source, i.e.,

mkdir build
cd build
cmake -D FINUFFT_USE_CUDA=ON -D FINUFFT_STATIC_LINKING=OFF ..
cmake --build .

we used to end up getting libcufinufft.so in the root (i.e., in build itself), but now it ends up in src/cuda/. I'm not sure this is intentional, since compiling the CPU code ends up with libfinufft.so in the root.