Recommend cpython agnosticism in cpp custom op tutorial #3824

Job	Run time
pytorch_tutorial_build_worker (1, 15, linux.g5.12xlarge.nvidia.gpu)	14m 10s
pytorch_tutorial_build_worker (2, 15, linux.g5.4xlarge.nvidia.gpu)	49m 52s
pytorch_tutorial_build_worker (3, 15, linux.g5.4xlarge.nvidia.gpu)	18m 19s
pytorch_tutorial_build_worker (4, 15, linux.g5.4xlarge.nvidia.gpu)	27m 40s
pytorch_tutorial_build_worker (5, 15, linux.g5.4xlarge.nvidia.gpu)	22m 8s
pytorch_tutorial_build_worker (6, 15, linux.g5.4xlarge.nvidia.gpu)	16m 59s
pytorch_tutorial_build_worker (7, 15, linux.4xlarge.nvidia.gpu)	22m 4s
pytorch_tutorial_build_worker (8, 15, linux.4xlarge.nvidia.gpu)	12m 37s
pytorch_tutorial_build_worker (9, 15, linux.4xlarge.nvidia.gpu)	18m 56s
pytorch_tutorial_build_worker (10, 15, linux.4xlarge.nvidia.gpu)	14m 10s
pytorch_tutorial_build_worker (11, 15, linux.4xlarge.nvidia.gpu)	14m 21s
pytorch_tutorial_build_worker (12, 15, linux.4xlarge.nvidia.gpu)	30m 11s
pytorch_tutorial_build_worker (13, 15, linux.4xlarge.nvidia.gpu)	40m 57s
pytorch_tutorial_build_worker (14, 15, linux.4xlarge.nvidia.gpu)	35m 45s
pytorch_tutorial_build_worker (15, 15, linux.4xlarge.nvidia.gpu)	29m 38s
pytorch_tutorial_build_manager	21m 59s
	6h 29m 46s

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