Fix CMakeList to include targets for CUDNN, NCCL

[dmudiger]

No description provided.

[dmudiger]

Minor changes to ensure right values for CUDNN, NCCL are passed.
Follow-up question (apologies for repurposing the PR, opening issues seem to be disabled) - it would help to include the ability to run with random data. Especially for performance measurements similar to results reported in the user guide (https://github.com/dmudiger/HugeCTR/blob/master/docs/hugectr_user_guide.md#hugectr)
(cc: @yuchenhao)

[minseokl]

Hi @dmudiger

1. Thanks for your interest in HugeCTR. You can actually set the custom paths to cuDNN and NCCL by setting the environment variables CUDNN_DIR and NCCL_DIR before doing ./configuring. @zehuanw and I will update our REAME.md to make the build instructions clearer.
2. By the way, could you briefly explain why you added build.sh? It seems like the file used in your computer. Did you commit it to illustrate how to configure and make the project?
3. Your suggestion on the random data generation would be useful for the performance analysis and architectural research, but I need to have an internal discussion to decide if we should prioritize it. For now, I suggest to follow the intructions in this link.

If you have more questions and issues, please let me know anytime.