Avoid a non-essential debug-only formatting dependency in the WIP Redox libwayland build so the verified relibc compatibility slice is not blocked by wl_closure_print diagnostics.
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)
Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
vasilito
967d0f8972