Rollup merge of rust-lang#84563 - jclulow:backtrace-upgrade, r=Mark-Simulacrum

Dylan-DPC · web-flow · commit 7969de2d9c8d · 2021-04-27T19:08:48.000+02:00
Update backtrace to 0.3.57

Adds support for symbol resolution on illumos systems.
diff --git a/library/backtrace b/library/backtrace
@@ -1 +1 @@
-Subproject commit 710fc18ddcb6c7677b3c96359abb35da37f2a488
+Subproject commit 221483ebaf45df5c956adffee2d4024e7c3b96b8
