Avoid unnecessary failures of auto-saving after fatal error
* src/w32.c (map_w32_filename): Avoid non-trivial system calls for the benefit of FAT volumes if we are called as part of shutting down due to a fatal error, which probably means we are trying to auto-save the session. * src/lread.c (check_obarray): Don't bother making the obarray valid if we are shutting down due to a fatal error. This avoids interfering with auto-saving the crashed session.
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