Merge branch 'for-upstream' of git://git.zytor.com/users/pcacjr/syslinux into elflink

Pull XFS changes from Paulo Alcantara,

 "feel free to pull my for-upstream branch on zytor. it contains the
  cache for directory blocks on XFS, ldlinux.c32 installation support
  for XFS and one trivial fix for shortform-directory lookup."

* 'for-upstream' of git://git.zytor.com/users/pcacjr/syslinux:
  extlinux: Also install ldlinux.c32 file on XFS
  xfs: Flush cache of directory blocks once done with readdir()
  xfs: Remove unnecessary free()'s
  xfs: Fix bug when listing shortform directory entries
  xfs: Add cache for directory blocks
  xfs: Make xfs_dir2_entry_name_cmp() inline
  xfs: Avoid useless malloc()'s and free()'s
  xfs: Make it more verbose on debug
  xfs: Improve error and debug printing
  xfs: Do some refactoring