Fix dynamo core test failure on Windows

[HolyWu]

Description

Fixes #3631

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project (You can use the linters)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas and hacks
• I have made corresponding changes to the documentation
• I have added tests to verify my fix or my feature
• New and existing unit tests pass locally with my changes
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[lanluo-nvidia]

@HolyWu
I was stuck on this issue, thanks for raising the PR, it helped a lot.
I have a question about this:
I know build requires this env script, we never has this on test previously.
Do you know if it is anything new introduced from upstream torch?
Why it only fails the dynamo core tests, does not fail other tests?

[HolyWu]

I suspect it's an upstream change in PyTorch too. But I don't know what combination will cause the compilation though.