Remove check-dependencies

The problem this addresses (manual dependency linking used to be mandatory) no longer exists

src/playground/check-dependencies.js

@@ -1,17 +0,0 @@
-// Check our dependencies to make sure we are using the TurboWarp versions forks.
-// This is a development tool. These messages should never be seen by users.
-
-/* eslint-disable */
-
-import VirtualMachine from 'scratch-vm';
-import RenderWebGL from 'scratch-render';
-
-if (!VirtualMachine.isTurboWarp) {
-    console.error('The installed scratch-vm is not the TurboWarp fork.');
-    alert('The installed scratch-vm is not the TurboWarp fork.');
-}
-
-if (!RenderWebGL.isTurboWarp) {
-    console.error('The installed scratch-render is not the TurboWarp fork.');
-    alert('The installed scratch-render is not the TurboWarp fork.');
-}

src/playground/import-first.js

@@ -1,3 +1,2 @@
 import './public-path';
-import './check-dependencies';
 import '../lib/normalize.css';