std.fs: prevent possible integer overflow in Dir.makePath
The call to `makeDir` for the top-level component of `sub_path`
can return `error.FileNotFound` if the directory represented by
`self` has been deleted.
Fixes #11397
618398b7d3Evan Haas committed on 4/15/2022, 8:19:23 AM· committed by Veikka Tuominenparentd66c61a