Fixes issues with errors like under Linux:

```
Opening zip "/(...)/downloads/sha256/c97f(...)/bin/bazel (deleted)": open(): No such file or directory
FATAL: Failed to open '/(...)/downloads/sha256/c97f(...)/bin/bazel (deleted)' as a zip file: (error: 2): No such file or directory
```

and below ones under Windows:

```
could not download Bazel: failed to download bazel: failed to move (...) (...)\bin\bazel.exe: Access is denied.
```

See: bazelbuild#436

Tested using `parallel_bazelisk_bug.go` script under Linux and Windows
that this change fixes issue.