Auto merge of #51931 - cramertj:rm-libbacktrace, r=alexcrichton
Auto merge of #51931 - cramertj:rm-libbacktrace, r=alexcrichton

Use in-tree libbacktrace on Fuchsia

cc @abarth

r? @alexcrichton
(welcome back! :smile: )

GBGamer/rust,graydon/rust,graydon/rust,GBGamer/rust,graydon/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust,GBGamer/rust