Add a sanity check to bootstrap for wasm-component-ld

For `wasm32-wasip2`-and-beyond this tool is required, so in case it's disabled in `config.toml` add a sanity-check that it's present in the environment.

src/bootstrap/src/core/sanity.rs

@@ -397,6 +397,16 @@ $ pacman -R cmake && pacman -S mingw-w64-x86_64-cmake
  );
  }
  }
+
+ // For testing `wasm32-wasip2`-and-beyond it's required to have
+ // `wasm-component-ld`. This is enabled by default via `tool_enabled`
+ // but if it's disabled then double-check it's present on the system.
+ if target.contains("wasip")
+ && !target.contains("wasip1")
+ && !build.tool_enabled("wasm-component-ld")
+ {
+ cmd_finder.must_have("wasm-component-ld");
+ }
  }
 
  if let Some(ref s) = build.config.ccache {