Since we moved to clangd the file doesn't exist anymore.
When creating the dmg packaging the process would print
multiple errors pointing to the fact that the clangbackend
file doesn't exist.
Change-Id: I172cfa43e67ec4aa9e5e2f8b703e024b803c78a1
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>