Zabbix

.......PS. [ZBX-22336] fixed signal blocking when logging from threads

Merge in ZBX/zabbix from feature/ZBX-22336-6.4 to release/6.4

* commit '4213cd5932efd7197de6b817905bd89969b39215':
  .......PS. [ZBX-22336] restored exit signal logging when proxy child process is killed during startup
  .......PS. [ZBX-22336] restored exit signal logging when server/proxy is killed during startup
  ...G...PS. [ZBX-22336] removed redundant code
  ...G...... [ZBX-22336] fixed windows build
  ...G...PS. [ZBX-22336] moved loglevel change logging from signal to logger subsystem
  ...G...PS. [ZBX-22336] removed logging of signal redirect failure in the case of shutdown
  ...G...PS. [ZBX-22336] removed logging about received sigusr1 signal
  ...G...PS. [ZBX-22336] fixed warnings
  ...G...PS. [ZBX-22336] replaced SIGPIPE handler with SIG_IGN
  ...G...PS. [ZBX-22336] removed logging in alarm signal handler
  ...G...PS. [ZBX-22336] reworked termination and child signal handling to avoid logging from handlers
  .......PS. [ZBX-22336] replaced VLA with malloc
  .......PS. [ZBX-22336] fixed signal blocking when logging from threads
  .......PS. [ZBX-22336] removed unused function
  .......PS. [ZBX-22336] removed redundant assignment

(cherry picked from commit b928c05e0409a58744ffb61db87e12eb647d98c2)