New review comment by ahesford on void-packages repository

https://github.com/void-linux/void-packages/pull/43946#discussion_r1217437147

Comment:
The benefit of cleaning up the test directory *after* we've used it is that we (attempt to) restore the source tree to the state it was in when the function was first called.

The benefit of cleaning up the directory *before* it would normally exist seems dubious. If we agree there is no need to clean up the test after a successful run, I think changing the directory name as you've done is sufficient.