Extend the new in 1.9 svn_wc_cleanup4() api with notification support.
This will allow future patches to add some information on where the time
is spent during the cleanup (that used to be +- instant in 1.6).

* subversion/include/svn_wc.h
  (svn_wc_cleanup4): Update prototype.

* subversion/libsvn_client/cleanup.c
  (do_cleanup): Update caller.

* subversion/libsvn_wc/cleanup.c
  (svn_wc_cleanup4): Update prototype.

* subversion/libsvn_wc/deprecated.c
  (svn_wc_cleanup3): Update caller.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1549825 13f79535-47bb-0310-9956-ffa450edef68