Move delete file logic into windows.DeleteFile fn

This way, we can remove more `kernel32` calls such as `RemoveDirectoryW`
or `DeleteFileW`, and use `std.os.windows.DeleteFile` instead which
is purely NT-based.
8981b18feeJakub Konka committed on 7/31/2020, 2:31:51 PMparent66bbe4e
5 files changedLine totals unavailable