Kaitai Struct produced a nim code that can't be compiled?
Hi, I'm new to KS and nim. In fact  I tried to clone serializable branch of KS according to the [serialization guide](https://doc.kaitai.io/serialization.html). Then I got scala-sbt from https://repo.scala-sbt.org/scalasbt/debian according to their [doc](https://www.scala-sbt.org/1.x/docs/Installing-sbt-on-Linux.html) and successfully build ksc.

After that I tried to generate a code for this file: https://gitlab.com/librespacefoundation/satnogs/satnogs-decoders/-/blob/master/ksy/siriussat.ksy

with `../jvm/target/universal/stage/bin/kaitai-struct-compiler  --no-auto-read -t all ../siriussat.ksy`

and got `nim/siriussat.nim` file.   

So I installed nim from repository with `sudo apt install nim` and tried to compile it to C code with:  `nim c siriussat.nim`
And got error: `/tmp/kaitai_struct_compiler/cpp/nim/siriussat.nim(1, 8) Error: cannot open file: kaitai_struct_nim_runtime`

Thus I downloaded this file into the same folder: https://github.com/kaitai-io/kaitai_struct_nim_runtime/blob/master/kaitai_struct_nim_runtime.nim  

and tried again. Now I got error:   
`/tmp/kaitai_struct_compiler/cpp/nim/siriussat.nim(967, 16) Error: undeclared identifier: 'rptInstance'`

And I guess that's a generated nim code problem.

I tried to switch to the master branch of ksc and tried it without `--read-write` argument and got the same result.

May be I misunderstood something and this could be workarounded?

My aim is to get C or C++ serializer code from ksy wile via nim code as direct cpp serializer code generation isn't supported
