Merge branch 'jl/maint-1.7.10-recurse-submodules-with-symlink'

When "git submodule add" clones a submodule repository, it can get confused where to store the resulting submodule repository in the superproject's .git/ directory when there is a symbolic link in the path to the current directory. * jl/maint-1.7.10-recurse-submodules-with-symlink: submodules: don't stumble over symbolic links when cloning recursively