Merge branch 'ab/conditional-config-with-symlinks'

The recently introduced "[includeIf "gitdir:$dir"] path=..." mechansim has further been taught to take symlinks into account. The directory "$dir" specified in "gitdir:$dir" may be a symlink to a real location, not something that $(getcwd) may return. In such a case, a realpath of "$dir" is compared with the real path of the current repository to determine if the contents from the named path should be included. * ab/conditional-config-with-symlinks: config: match both symlink & realpath versions in IncludeIf.gitdir:*