[faiproject/fai] e0d7b4: handle broken symlinks, Closes: #985303

[Mrfai]

  Branch: refs/heads/master
  Home:   https://github.com/faiproject/fai
  Commit: e0d7b4910e1b297f9d0a09a43e6e1d639a5cf3e2
      https://github.com/faiproject/fai/commit/e0d7b4910e1b297f9d0a09a43e6e1d639a5cf3e2
  Author: Thomas Lange <lange at debian.org>
  Date:   2022-05-26 (Thu, 26 May 2022)

  Changed paths:
    M bin/fcopy

  Log Message:
  -----------
  handle broken symlinks, Closes: #985303