can not pass --cc option to nim compiler ?
* command

```shell
nimble build -d:release \
  --cc:clang --clang.exe:zigcc --clang.linkerexe:zigcc \
  --passC="--target x86_64-linux-musl" --passL="--target x86_64-linux-musl"
```

* error info
```
Error: arguments can only be given if the '--run' option is selected
nimble.nim(229)          buildFromDir
```