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

Use in-tree libbacktrace on Fuchsia

cc @abarth

r? @alexcrichton
(welcome back! 😄 )

Author: bors

Diff for: src/libstd/build.rs

@@ -22,7 +22,6 @@ fn main() {
     if cfg!(feature = "backtrace") &&
         !target.contains("cloudabi") &&
         !target.contains("emscripten") &&
-        !target.contains("fuchsia") &&
         !target.contains("msvc") &&
         !target.contains("wasm32")
     {
@@ -68,10 +67,6 @@ fn main() {
         println!("cargo:rustc-link-lib=userenv");
         println!("cargo:rustc-link-lib=shell32");
     } else if target.contains("fuchsia") {
-        // use system-provided libbacktrace
-        if cfg!(feature = "backtrace") {
-            println!("cargo:rustc-link-lib=backtrace");
-        }
         println!("cargo:rustc-link-lib=zircon");
         println!("cargo:rustc-link-lib=fdio");
     } else if target.contains("cloudabi") {