Zabbix

...G...... [ZBX-20472] fixed database lock crash in Zabbix Agent 2 using SQLite

Merge in ZBX/zabbix from feature/ZBX-20472-5.0 to release/5.0

* commit '4c0b7f13d9e828f3cf4511288529b96a62f57661':
  ...G...... [ZBX-20472] decreased number of locks
  ...G...... [ZBX-20472] fixed coding style
  ...G...... [ZBX-20472] enlarged critical sections
  ...G...... [ZBX-20472] fixed database lock crash in Zabbix Agent 2 using SQLite

(cherry picked from commit 27bb99b4a451e034eb08fd24e77040d33c2e591a)
(cherry picked from commit 538e9fe6e864b0fedd51cbbf5761f1f7a26df699)
(cherry picked from commit 6132b69c58ae0b77ce536e0dc6f12905e7c06e00)