Packaging torch fails with File exists (Windows)

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**Setup**
```ps
PS C:\vinegar2> pyoxidizer --version
PyOxidizer 0.16.0
commit: 4053178f2ba11d29f497d171289cb847cd07ed77
source: https://github.com/indygreg/PyOxidizer.git
pyembed crate location: version = "0.16.0"

PS C:\vinegar2> [System.Environment]::OSVersion.Version

Major Minor Build Revision
----- ----- ----- --------
10 0 21382 0
```
Minimal `pyoxidizer.bzl` (pip installs `torch`):
[pyoxidizer.bzl.txt](https://github.com/indygreg/PyOxidizer/files/6517970/pyoxidizer.bzl.txt)

**Error**
```
PS C:\vinegar2> pyoxidizer run

adding extra file lib/zoneinfo/_zoneinfo.py to .
adding extra file python3.dll to .
adding extra file python39.dll to .
adding extra file vcruntime140.dll to .
adding extra file vcruntime140_1.dll to .
installing files to C:\vinegar2\.\build\x86_64-pc-windows-msvc\debug\install
error: error calling build(): Runtime(RuntimeError { code: "TUGGER_FILE_MANIFEST", message: "Eine Datei kann nicht erstellt werden, wenn sie bereits vorhanden ist. (os error 183)", label: "FileManifest.build()" })
```
The error translates to `File couldn't be created since it already exists`.

**Expected**
An interactive shell where `import torch` works.

Start with the attached minimal pyoxidizer.bzl configuration and reproduce the failure with `pyoxidizer run` on Windows. Trace the `FileManifest.build()` error and the reported existing-file conflict; done means the installation completes and the resulting interactive shell can successfully `import torch`.

Written by the indexing model from the issue text.