Make backtraces work on Redox, copying Unix implementation#43635

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bors merged 3 commits intorust-lang:masterfrom

ids1024:backtrace-redox

Aug 15, 2017

Commits on Aug 4, 2017

Update libbacktrace config.sub from http://git.savannah.gnu.org/cgit/config.git
ids1024
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Make backtraces work on Redox, copying Unix implementation
ids1024
committed
Simplify Redox backtrace/ to not include non-Redox implementations
ids1024
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