chore(CMakeLists): remove obsolete option
chore(CMakeLists): remove obsolete option

Kha/lean,leodemoura/lean,rlewis1988/lean,digama0/lean,fgdorais/lean,fgdorais/lean,rlewis1988/lean,rlewis1988/lean,leodemoura/lean,fpvandoorn/lean,fgdorais/lean,leanprover/lean,dselsam/lean,leodemoura/lean,digama0/lean,rlewis1988/lean,leanprover-community/lean,dselsam/lean,leanprover/lean,Kha/lean,rlewis1988/lean,fpvandoorn/lean,fgdorais/lean,leodemoura/lean,leanprover-community/lean,fpvandoorn/lean,Kha/lean,leanprover-community/lean,digama0/lean,fpvandoorn/lean,johoelzl/lean,Kha/lean,johoelzl/lean,leodemoura/lean,digama0/lean,dselsam/lean,leanprover-community/lean,leanprover/lean,leodemoura/lean,digama0/lean,avigad/lean,johoelzl/lean,johoelzl/lean,fpvandoorn/lean,digama0/lean,avigad/lean,johoelzl/lean,avigad/lean,leanprover-community/lean,leanprover-community/lean,fgdorais/lean,dselsam/lean,Kha/lean,leanprover/lean,fgdorais/lean,fpvandoorn/lean,Kha/lean,rlewis1988/lean,leanprover/lean,dselsam/lean,avigad/lean,dselsam/lean,avigad/lean,avigad/lean,johoelzl/lean,leanprover/lean