Disable rpath for lld when requested

(unrelated to getting rustc to compile for wasi)

Author: bjorn3

src/bootstrap/src/core/build_steps/llvm.rs

@@ -1212,6 +1212,9 @@ impl Step for Lld {
             // `$ORIGIN` would otherwise be expanded when the `LdFlags` are passed verbatim to
             // cmake.
             ldflags.push_all("-Wl,-rpath,'$ORIGIN/../../../'");
+        } else {
+            // CMake defaults to building executables with rpath enabled.
+            cfg.define("CMAKE_SKIP_RPATH", "ON");
         }
 
         configure_cmake(builder, target, &mut cfg, true, ldflags, &[]);