[Filesystem] Try to delete broken symlinks
[Filesystem] Try to delete broken symlinks

If you delete the target of a symlink (at least on Windows systems) you
don't get the kind of the target anymore (obviously). Therefore it might
happen that a broken symlink to a directory should be removed with
unlink() which fails. This patch adds another check for a broken symlink
and tries to remove with rmdir() before throwing an exception. It helps
to clean up test folders on Windows systems (so already proofed by the
existing tests).

symfony/Filesystem