CUDA: Don't invoke the binding in JITCUDACodegen
CUDA: Don't invoke the binding in JITCUDACodegen

This appears to be unused / unneeded, and forces loading of NVVM to
create a JITCUDACodegen (which is problematic because they get created
at import time). This commit removes the invocation of the binding.

numba/numba,cpcloud/numba,numba/numba,numba/numba,cpcloud/numba,numba/numba,numba/numba,cpcloud/numba,cpcloud/numba,cpcloud/numba