Zabbix

.......PS. [ZBXNEXT-8058] reduced locking between history syncers, trappers and proxy pollers

Merge in ZBX/zabbix from feature/ZBXNEXT-8058-5.0 to release/5.0

* commit 'e070bc99751c139bc632252fa3d8fe42239ec0a0':
  ........S. [ZBXNEXT-8058] fixed make dist
  ........S. [ZBXNEXT-8058] style fix
  .D........ [ZBXNEXT-8058] added ChangeLog entry
  ........S. [ZBXNEXT-8058] improved item tag retrieval to use new lock
  .......PS. [ZBX-21825] removed redundant variable
  .......PS. [ZBX-21825] fixed trigger deletion from services
  .......PS. [ZBX-21825] removed redundant header
  .......PS. [ZBX-21825] removed redundant variables
  .......PS. [ZBX-21825] backported from master
  ........S. [ZBX-21825] fixed locking of history syncers when triggers are being deleted