Auto merge of #55106 - petrhosek:fuchsia-lld, r=alexcrichton

Use lld directly for Fuchsia target

Fuchsia already uses lld as the default linker, so there's no reason
to always invoke it through Clang, instead we can simply invoke lld
directly and pass the set of flags that matches Clang.

src/bootstrap/lib.rs

@@ -837,7 +837,8 @@ impl Build {
         } else if target != self.config.build &&
                   !target.contains("msvc") &&
                   !target.contains("emscripten") &&
-                  !target.contains("wasm32") {
+                  !target.contains("wasm32") &&
+                  !target.contains("fuchsia") {
             Some(self.cc(target))
         } else {
             None