Remove unused flags from build script.

Author: jianjunz

scripts/build.js

@@ -20,7 +20,6 @@ optParser.addOption('v', 'verbose', 'boolean', 'Whether use verbose level in bui
 optParser.addOption('r', 'rebuild', 'boolean', 'Whether clean before build');
 optParser.addOption('c', 'check', 'boolean', 'Whether check after build');
 optParser.addOption('j', 'jobs', 'string', 'Number of concurrent build jobs');
-optParser.addOption('f', 'features', 'list', 'Specify experinmental features to be enabled. Available features: quic.')
 
 const options = optParser.parseArgs(process.argv);