message: check library syntax
diff: @@ -13,7 +13,14 @@ if (empty($list)) {
  }
  $source_str = $eval_str = '';
  foreach ($list as $file) {
  - $code = file_get_contents(LIB_DIR . '/' . $file);
  +
  + $php_file = LIB_DIR . '/' . $file;
  + if (!_string(`php -n -l $php_file`)->contains('No syntax errors detected')) {
  + swoole_error("syntax error in [$php_file]");
  + } else {
  + swoole_ok("syntax correct in [$php_file]");
  + }
  + $code = file_get_contents($php_file);
  if ($code === false) {
  swoole_error("can not read file {$file}");
  }
  