Revert "incase of symlink, we should just delete it instead of calling...

Revert "incase of symlink, we should just delete it instead of calling os.chmod that tries to chmod the original that can raise 'Operation not permitted' error."

This reverts commit 2c2b8c43.

src/zc/buildout/rmtree.py

@@ -54,9 +54,6 @@ def rmtree (path):
     0
     """
     def retry_writeable (func, path, exc):
-        if func == os.path.islink:
-            os.unlink(path)
-        else:
         os.chmod (path, 0600)
         func (path)