In FSX, make revision data packing code use the batch fsync infrastructure.
In FSX, make revision data packing code use the batch fsync infrastructure.

* subversion/libsvn_fs_x/pack.c
  (initialize_pack_context): Implicitly schedule an fsync through the BATCH.
  (close_pack_context): No need for the explicit fsync here anymore.
  (pack_log_addressed): Create the fsync batch locally and run it here.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1711379 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion