Fix minor constant declaration issue.
Fix minor constant declaration issue.

* subversion/libsvn_fs_fs/index.c
  (off_t_max): This one is supposed to be static.

Found by: breser

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1634920 13f79535-47bb-0310-9956-ffa450edef68

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