fix: dont call path.join on external urls, it breaks them

Author: thepassle

.changeset/green-peas-sit.md

@@ -0,0 +1,5 @@
+---
+'@web/rollup-plugin-polyfills-loader': patch
+---
+
+dont path.join on external urls, it breaks them

packages/rollup-plugin-polyfills-loader/src/rollupPluginPolyfillsLoader.ts

@@ -88,7 +88,7 @@ export function polyfillsLoader(pluginOptions: RollupPluginPolyfillsLoaderConfig
           // js files (incl. chunks) will always be in the root directory
           const pathToRoot = path.posix.dirname(importPath);
           for (const chunkPath of entrypoint.chunk.imports) {
-            const relativeChunkPath = normalize(path.posix.join(pathToRoot, chunkPath));
+            const relativeChunkPath = normalize(chunkPath.startsWith('http') ? chunkPath : path.posix.join(pathToRoot, chunkPath));
             preloaded.push(relativeChunkPath);
           }
         }