Merge branch 'mw/symlinks'

All subcommands that take pathspecs mishandled an in-tree symbolic link when given it as a full path from the root (which arguably is a sick way to use pathspecs). "git ls-files -s $(pwd)/RelNotes" in our tree is an easy reproduction recipe. * mw/symlinks: setup: don't dereference in-tree symlinks for absolute paths setup: add abspath_part_inside_repo() function t0060: add tests for prefix_path when path begins with work tree t0060: add test for prefix_path when path == work tree t0060: add test for prefix_path on symlinks via absolute paths t3004: add test for ls-files on symlinks via absolute paths