Bug #47389 Innodb tests are skipped when running as unix root user

Add --user=root to collect_mysqld_features() if running as root
Please disregard previous commit; this is much simpler.

mysql-test/mysql-test-run.pl

@@ -1482,6 +1482,12 @@ sub collect_mysqld_features {
   mtr_add_arg($args, "--verbose");
   mtr_add_arg($args, "--help");
 
+  # Need --user=root if running as *nix root user
+  if (!IS_WINDOWS and $> == 0)
+  {
+    mtr_add_arg($args, "--user=root");
+  }
+
   my $exe_mysqld= find_mysqld($basedir);
   my $cmd= join(" ", $exe_mysqld, @$args);
   my $list= `$cmd`;