Don't ship tsserverlibrary.js

Fixes microsoft#37606

Author: mjbvz

extensions/postinstall.js

@@ -7,7 +7,7 @@
 
 const fs = require('fs');
 const path = require('path');
-const toDelete = new Set(['tsc.js', 'typescriptServices.js']);
+const toDelete = new Set(['tsc.js', 'tsserverlibrary.js', 'typescriptServices.js']);
 
 const root = path.join(__dirname, 'node_modules', 'typescript', 'lib');
 for (let name of fs.readdirSync(root)) {