Remove some dead code (it is over in old-and-busted.c)
Remove some dead code (it is over in old-and-busted.c)

* subversion/libsvn_wc/entries.c:
  (string_to_opt_revision, opt_revision_to_string,
      unserialize_file_external, serialize_file_external,
      resolve_to_defaults): removed


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@875994 13f79535-47bb-0310-9956-ffa450edef68

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