merge-recursive: symlink's descendants not in way

merge-recursive: symlink's descendants not in way

When the working tree has:
 - bar (directory)
 - bar/file (file)
 - foo (symlink to .)

(note that lstat() for "foo/bar" would tell us that it is a directory)

and the user merges a commit that deletes the foo symlink and instead
contains:
 - bar (directory, as above)
 - bar/file (file, as above)
 - foo (directory)
 - foo/bar (file)

the merge should happen without requiring user intervention. However,
this does not happen.

This is because dir_in_way(), when checking the working tree, thinks
that "foo/bar" is a directory. But a symlink should be treated much the
same as a file: since dir_in_way() is only checking to see if there is a
directory in the way, we don't want symlinks in leading paths to
sometimes cause dir_in_way() to return true.

Teach dir_in_way() to also check for symlinks in leading paths before
reporting whether a directory is in the way.

Helped-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>