Temporarily wrap files.rename on non-Windows platforms to validate safety.
Temporarily wrap files.rename on non-Windows platforms to validate safety.

Now that files.rename uses Promise.prototype.await on Windows, it's
important to be sure it never gets called outside of a Fiber. Though we
don't run our full test suite on Windows, we can validate this expectation
by wrapping files.rename on all platforms. This commit should be reverted
once the validation is complete.

Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor,Hansoft/meteor