Test `lower-case drive` fails on the second run.

[soulomoon]

On the second run, the test lower-case drive would just fail since we read from interface file instead of typecheck it again.

[soulomoon]

So #4572 would seperate interface cache dir for each runs of test too ? If so #4572 would fix this test too. @fendor

[fendor]

I expect the same, now how to fix the windows CI of #4572 🤔