In preparation for running more of the post commit processing in a single
sqlite transaction, update read only status for unlock operations from the
working queue.

This probably introduces a temporary performance regression for this scenario.

* subversion/libsvn_wc/adm_ops.c
  (svn_wc_remove_lock2): Create work item and pass that to db operation.

* subversion/libsvn_wc/update_editor.c
  (close_file): Update caller.

* subversion/libsvn_wc/wc_db.c
  (lock_remove_txn,
   svn_wc__db_lock_remove): Add work_items handling.

* subversion/libsvn_wc/wc_db.h
  (svn_wc__db_lock_remove): Add work_items handling.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1630312 13f79535-47bb-0310-9956-ffa450edef68