the files all end up with th wrong name but they contain actual Aarch64 code

I dunno if the code _works_ but one thing at a time man

but maybe

it won't work because there is no zfec wheel and the naive attempt to build fails

Just a few build script customizations to make it build in the flake
environment

The error:

```
No signature of method: build_2w1jlqy9b1j5vn4y3z28u0xpk.android() is applicable for argument types: (build_2w1jlqy9b1j5vn4y3z28u0xpk$_run_closure1) values: [build_2w1jlqy9b1j5v
n4y3z28u0xpk$_run_closure1@53850fb8]
```

it doesn't work though

so use the apk derivation directly!  yea!

`buildozer -v android debug` dumps a ton of stuff into `.buildozer` so the
builds are hardly reproducible, even with all this effort ...