Updating libbacktrace

Hi all,

Could one of the GDB global maintainers possibly update libbacktrace
from the copy in gcc.git?

I'm also happy to do it if delegated to. Whatever works for me.

I originally asked at https://sourceware.org/PR31327 (as it fixes some
test failures) where Ian ACKed it, but wasn't sure of the policy on
it. Nick, the binutils maintainer, deferred to GDB as GDB is the primary
consumer of libbacktrace.

Nick also suggested we clarify its status in MAINTAINERS.

thanks,
sam

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