fix(bin/leanpkg): handle spaces in paths on POSIX systems
fix(bin/leanpkg): handle spaces in paths on POSIX systems

fpvandoorn/lean,leanprover/lean,dselsam/lean,leanprover-community/lean,dselsam/lean,Kha/lean,Kha/lean,leanprover-community/lean,leanprover/lean,dselsam/lean,leanprover/lean,dselsam/lean,leanprover-community/lean,dselsam/lean,fpvandoorn/lean,leanprover/lean,Kha/lean,fpvandoorn/lean,digama0/lean,Kha/lean,digama0/lean,leanprover-community/lean,fpvandoorn/lean,digama0/lean,digama0/lean,digama0/lean,dselsam/lean,digama0/lean,fpvandoorn/lean,fpvandoorn/lean,leanprover-community/lean,Kha/lean,leanprover/lean,leanprover-community/lean,Kha/lean,leanprover/lean