Include parlai/clib/cuda/ngram_repeat_block_cuda_kernel.* (#4721)
Include parlai/clib/cuda/ngram_repeat_block_cuda_kernel.* (#4721)

Include parlai/clib/cuda/ngram_repeat_block_cuda_kernel.* files, otherwise I can't seem to build models. For example, 
  parlai.core.agents.create_agent_from_mode_file('zoo:bb3/bb3_3B/model')
fails with
No such file or directory: ../clib/cuda/ngram_repeat_block_cuda.cpp
facebookresearch/ParlAI,facebookresearch/ParlAI,facebookresearch/ParlAI,facebookresearch/ParlAI,facebookresearch/ParlAI