Fix is_ninja_available()
Author: niltok
Pull request: yes

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i noticed that ninja cannot be detected by importlib because it is not a python package, so i fixed is_ninja_available() with an [implementation comes from pytorch](https://github.com/pytorch/pytorch/blob/4882cd08013733a5dbe299871ad7e974bce074b3/torch/utils/cpp_extension.py#L1629). 


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Comments:
_The documentation is not available anymore as the PR was closed or merged._

> Thanks for your PR! Can you just run `make style` on your branch to fix the quality issue?

i have passed all checks now!!

Thanks!