Fix generating files for Vulkan on Windows (#69696)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69696
Using `find` is not portable as it won't be there on Windows for example. We can use `glob` with the recursive option added in Python 3.5 instead.
Test Plan: CircleCI
Reviewed By: xta0
Differential Revision: D32994229
fbshipit-source-id: 4a755c4313300142c051f533d0b3876dc9035da0
