fix(shell/CMakeLists): ignore temporary emacs files
fix(shell/CMakeLists): ignore temporary emacs files

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