Resolve two warnings in libsvn_fs_x on non-posix systems.
Resolve two warnings in libsvn_fs_x on non-posix systems.

* subversion/libsvn_fs_x/batch_fsync.c
  (internal_open_file): Reduce scope of one variable and conditionally
    define another one.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1764437 13f79535-47bb-0310-9956-ffa450edef68

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