Support running cross-windows binaries in the shell using Wine

commit f0f3427c:

cerbero: Use pathlib to convert posix paths to wine paths
This covers more edge cases.

commit 0e66e85e:

cerbero: Run cross-winXX binaries with Wine inside the shell
With this, we can run gst-launch-1.0 pipelines inside the cross-winXX
shell like so:

```sh
$ wine gst-launch-1.0.exe videotestsrc ! autovideosink
```

Note that the `.exe` program name suffix is necessary.

This is useful for testing Windows plugins on Linux.