[Sys] Remove SIGKILL from exit handler (#100)
[Sys] Remove SIGKILL from exit handler (#100)

SIGKILL cannot be caught so there is no point attempting to register
actions, which generates warnings in certain environments, such as
Valgrind:

  ==31674== Warning: ignored attempt to set SIGKILL handler in sigaction();
  ==31674==          the SIGKILL signal is uncatchable
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