exec: Add kill action to system call filters
Define explicit action "kill" for SystemCallErrorNumber=. In addition to errno code, allow specifying "kill" as action for SystemCallFilter=. --- v7: seccomp_parse_errno_or_action() returns -EINVAL if !HAVE_SECCOMP v6: use streq_ptr(), let errno_to_name() handle bad values, kill processes, init syscall_errno v5: actually use seccomp_errno_or_action_to_string(), don't fail bus unit parsing without seccomp v4: fix build without seccomp v3: drop log action v2: action -> number
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