Fix compiler warning.
Fix compiler warning.

* subversion/libsvn_subr/string.c
  (svn_string__similarity): Use apr_size_t instead of int.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1470930 13f79535-47bb-0310-9956-ffa450edef68

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