Fix max build not generated...

Tools/Gulp/tasks/gulpTasks-libraries.js

@@ -84,7 +84,7 @@ var buildExternalLibrariesMultiEntry = function(libraries, settings, isMin) {
     }
 
     // Generate minified file.
-    let wpBuild = webpackStream(wpConfig, webpack);
+    let wpBuild = webpackStream({ config: wpConfig }, webpack);
     return wpBuild.pipe(gulp.dest(outputDirectory));
 }
 

Tools/Gulp/tasks/gulpTasks-viewerLibraries.js

@@ -27,7 +27,7 @@ var buildViewerLibrary = function (library, settings, out) {
         wpConfig.mode = "development";
     }
 
-    let wpBuild = webpackStream(wpConfig, webpack);
+    let wpBuild = webpackStream({ config: wpConfig }, webpack);
 
     //shoud dtsBundle create the declaration?
     if (settings.build.dtsBundle) {