build: use no async option for ngcc (#1238)

Author: CaerusKaru

package.json

@@ -25,7 +25,7 @@
     "lib:test:ssr": "gulp test:ssr",
     "universal:build": "gulp ci:prerender",
     "universal:serve": "gulp universal:serve",
-    "postinstall": "ngcc --properties es2015 browser module main --create-ivy-entry-points"
+    "postinstall": "ngcc --properties es2015 browser module main --no-async --create-ivy-entry-points"
   },
   "version": "9.0.0-beta.29",
   "requiredAngularVersion": ">=9.0.0-rc.11",