cargo build fails, unable to find PyInit_oxidized_importer

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Running `cargo build` in a fresh checkout of the repo produces the following error:

```
[...snip...]
Compiling pyembed v0.8.0-pre (C:\Users\Dylan\Desktop\PyOxidizer\pyembed)
[...snip...]
Compiling oxidized-importer v0.8.0-pre (C:\Users\Dylan\Desktop\PyOxidizer\oxidized-importer)
error[E0425]: cannot find function, tuple struct or tuple variant `PyInit_oxidized_importer` in crate `pyembed`
--> oxidized-importer\src\lib.rs:11:14
|
11 | pyembed::PyInit_oxidized_importer()
| ^^^^^^^^^^^^^^^^^^^^^^^^ not found in `pyembed`
|
help: consider importing this function
|
5 | use crate::PyInit_oxidized_importer;
|

error: aborting due to previous error

For more information about this error, try `rustc --explain E0425`.
error: could not compile `oxidized-importer`.

To learn more, run the command again with --verbose.
warning: build failed, waiting for other jobs to finish...
error: build failed
```

Start by running `cargo build` in a fresh checkout and inspect `oxidized-importer/src/lib.rs`, especially its call to `pyembed::PyInit_oxidized_importer()`. Trace where the `PyInit_oxidized_importer` symbol is defined or generated in `pyembed`; done means the fresh checkout builds without the missing-function error.

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