Rollup merge of #78276 - cutsoy:bump-backtrace, r=nagisa

Bump backtrace-rs to enable Mach-O support on iOS.

Related to rust-lang/backtrace-rs#378. Fixes backtraces on iOS that were missing in Rust v1.47.0 after switching to gimli because it only enabled Mach-O support on macOS.
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Yuki Okushi 2020-10-25 18:43:44 +09:00 committed by GitHub
commit 3e017c709d
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Subproject commit a6dd47bd588c882e735675a1379d2b61719fa380
Subproject commit 8b8ea53b56f519dd7780defdd4254daaec892584