[Nano-devel] [PATCH] restore terminal and print backtrace for segfaults and assertions

[Brand Huntsman]

These patches add a segfault handler and custom assertion handler that restore 
the terminal before exiting. The first patch also displays a backtrace.

The backtrace-less patch only increased the nano binary by 32 bytes and
would be nice to have in case nano ever segfaults in normal use or when 
testing. The backtrace patch would give users an idea where nano crashed, for 
bug reports, but increased the binary by 24k. The backtrace code could be
placed behind a --with-backtrace configure option for users or --enable-debug 
for devs.

restore-terminal-and-print-backtrace-for-segfaults-and-assertions.patch
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restore-terminal-for-segfaults-and-assertions.patch
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