fix pathing in Windows

Author: hansl

packages/webpack/src/loader.ts

@@ -27,11 +27,12 @@ function _removeDecorators(fileName: string, source: string): string {
 
 
 function _replaceBootstrap(fileName: string, source: string, plugin: NgcWebpackPlugin) {
-  const basePath = plugin.angularCompilerOptions.basePath;
-  const entryModuleFileName = plugin.entryModule.split('#')[0] + '.ngfactory';
+  const basePath = path.normalize(plugin.angularCompilerOptions.basePath);
+  const entryModuleFileName = path.normalize(plugin.entryModule.split('#')[0] + '.ngfactory');
   const relativeEntryModulePath = path.relative(basePath, entryModuleFileName);
   const fullEntryModulePath = path.resolve(plugin.genDir, relativeEntryModulePath);
-  const ngFactoryPath = './' + path.relative(path.dirname(fileName), fullEntryModulePath);
+  const relativeNgFactoryPath = path.relative(path.dirname(fileName), fullEntryModulePath);
+  const ngFactoryPath = './' + relativeNgFactoryPath.replace(/\\/g, '/');
 
   return source
     .replace(/(import.*)\bplatformBrowserDynamic\b(.*\/)platform-browser-dynamic(\b.*)$/m,