Make 'svn checkout' report externals failures via its exit code, like the export, list, switch, and update subcommands already do.
Make 'svn checkout' report externals failures via its exit code,
like the export, list, switch, and update subcommands already do.

* subversion/svn/checkout-cmd.c
  (svn_cl__checkout): Make use of svn_cl__check_externals_failed_notify_wrapper.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1628398 13f79535-47bb-0310-9956-ffa450edef68

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