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

setup.py

@@ -37,7 +37,7 @@
         packages=find_packages(exclude=('data', 'docs', 'tests', 'parlai_internal*')),
         install_requires=reqs,
         include_package_data=True,
-        package_data={'': ['*.txt', '*.md', '*.opt']},
+        package_data={'': ['*.txt', '*.md', '*.opt', '*.cu', '*.cpp']},
         entry_points={
             "flake8.extension": ["PAI = parlai.utils.flake8:ParlAIChecker"],
             "console_scripts": ["parlai=parlai.__main__:main"],