Rely on #[link] attribute for unwind on Fuchsia.

Closes rust-lang#95575.

Author: anp

library/unwind/build.rs

@@ -40,8 +40,6 @@ fn main() {
         // This is handled in the target spec with late_link_args_[static|dynamic]
     } else if target.contains("uwp-windows-gnu") {
         println!("cargo:rustc-link-lib=unwind");
-    } else if target.contains("fuchsia") {
-        println!("cargo:rustc-link-lib=unwind");
     } else if target.contains("haiku") {
         println!("cargo:rustc-link-lib=gcc_s");
     } else if target.contains("redox") {