Close all the log fds before aborting
We should close the sigsafe_log_fds before abort(), so that we are less likely to lose log lines in the fd buffers.
Here are the abort() users:
- define a raw_abort() function that closes the fds
- use it instead of abort()
- #define trunnel_abort() as raw_abort()
- update our C linter to require raw_abort() instead of abort()
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