Get rid of some compiler warnings about casts.
Get rid of some compiler warnings about casts.

* subversion/libsvn_wc/upgrade.c
  (struct bump_baton): New.
  (bump_to_14, bump_to_17, bump_to_XXX): Use struct.
  (svn_wc__upgrade_sdb): Use struct, remove casts.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@959370 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion