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Previously it was possible to achieve a deadlock in a signal handler, for example when SIGTERM (i.e. sent by `pgbackrest stop --force`) arrives when a lock used in `gmtime_r` is taken. Then the next time logging is done, it will deadlock on `gmtime_r`. In general, most stdlib functions are not safe to call in signal handlers, only so called async-signal safe functions are. In particular, `snprintf` isn't safe since it is allowed to internally call `malloc`. The `exitSafe` function isn't safe due to extensive use of allocations. Because of this, we need to use a simpler logging format in signal handlers, one that only uses async-signal safe functions.