[Chore] ignore override default __init__.py when building from source

[aarnphm]

This PR continues from #17228 where installing from source will override vllm_flash_attn/__init__.py

Signed-off-by: Aaron Pham contact@aarnphm.xyz

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[DarkLight1337]

Does this fix both #17246 and #17247?

[aarnphm]

I can include #17247 here.

#17246 i need to see their ds.py, but i would assume that it is importing the stubs file instead of the actual file somehow.

[DarkLight1337]

If #17247 doesn't overlap with this PR then let's keep them separate

[aarnphm]

Superceded by #17267