fix(@angular/cli): account for project root in asset output path

Author: clydin

packages/@angular/cli/models/webpack-configs/common.ts

@@ -90,7 +90,7 @@ export function getCommonConfig(wco: WebpackConfigOptions) {
       // Prevent asset configurations from writing outside of the output path, except if the user
       // specify a configuration flag.
       // Also prevent writing outside the project path. That is not overridable.
-      const absoluteOutputPath = path.resolve(buildOptions.outputPath);
+      const absoluteOutputPath = path.resolve(projectRoot, buildOptions.outputPath);
       const absoluteAssetOutput = path.resolve(absoluteOutputPath, asset.output);
       const outputRelativeOutput = path.relative(absoluteOutputPath, absoluteAssetOutput);