[backend_cpu] Aidge backedn cpu build c++ fail due to introduction of WERROR
Job [#593325](https://gitlab.eclipse.org/eclipse/aidge/aidge_backend_cpu/-/jobs/593325) failed
This is due to the introduction of WERROR https://gitlab.eclipse.org/eclipse/aidge/aidge/-/work_items/144
This MR will solve the issue: https://gitlab.eclipse.org/eclipse/aidge/aidge_backend_cpu/-/merge_requests/178
issue