- removed a redundant "-u root" (it's included in $mysqladmin_args)

Build-tools/Do-compile

@@ -419,7 +419,7 @@ if ($opt_stage <= 9 && !$opt_no_test && !$opt_no_benchmark)
 rm_all($bench_tmpdir);
 rm_all("$opt_tmp") if ($new_opt_tmp);
 
-log_system("$pwd/$host/bin/mysqladmin $mysqladmin_args -S $mysql_unix_port -u root shutdown");
+log_system("$pwd/$host/bin/mysqladmin $mysqladmin_args -S $mysql_unix_port shutdown");
 print LOG "ok\n";
 close LOG;
 print "$host: ok\n";