Zabbix

.......PS. [ZBXNEXT-7615] added hmac function for embedded javascript engine

Merge in ZBX/zabbix from feature/ZBXNEXT-7615-6.1 to master

* commit 'c4e5c9c04560302912dc1cb6c5cb78e4f9a1bbf4':
  ........S. [ZBXNEXT-7615] fixed zbx_hmac() error handling in report cookie generation
  ........S. [ZBXNEXT-7615] removed zbx_hmac() error check based on zbx_bin2hex(), added zbx_hmac error check when creating report cookie
  .......PS. [ZBXNEXT-7615] fixed memory leak when zbx_hmac fails
  ........S. [ZBXNEXT-7615] removed deprecated function
  .D........ [ZBXNEXT-7615] added changelog entry
  ........S. [ZBXNEXT-7615] fixed warnings
  ........S. [ZBXNEXT-7615] replace hmac_sha256 function in report generation with new hmac function
  .......PS. [ZBXNEXT-7615] added hmac function for javascript