Remove wrong symlink check

Currently the code attempts to check whether the target of a symlink exists,
and does not extract the symlink if the target is deemed not to exist.

However, the check (`os.path.exists(os.path.join(target, i.linkname))`) is
buggy as it does not include the path of the symlink within target.

Even if this were fixed, the check would not be able to handle chains of
symlinks that happened to be iterated in the wrong order.

For now, remove the check entirely.

Author: leokoppel

sphinxcontrib/versioning/git.py

@@ -308,7 +308,8 @@ def extract(stdout):
                         tar.extract(member=info, path=target)
                         if os.path.splitext(info.name)[1].lower() == '.rst':
                             mtimes.append(info.name)
-                for info in (i for i in queued_links if os.path.exists(os.path.join(target, i.linkname))):
+                for info in queued_links:
+                    # There used to be a check for broken symlinks here, but it was buggy
                     tar.extract(member=info, path=target)
         except tarfile.TarError as exc:
             log.debug('Failed to extract output from "git archive" command: %s', str(exc))