MDEV-8669 MTR client connections on Windows became much slower.

The regression is caused by change bind-address server parameter
in MDEV-8083, so now server listens on IPv4 only by default.

The problem however is that on Windows, connection to server on localhost
appears to be much faster, if server listens on IPv6/dual stack.
mysql_real_connect() would try to connect to IPv6 loopback  first,
and if this fails, the failing connect() call takes several seconds.

To fix, use bind-address=* on Windows, and 127.0.0.1 elsewhere

mysql-test/include/default_mysqld.cnf

@@ -31,7 +31,6 @@ debug-no-sync
 
 # Retry bind as this may fail on busy server
 port-open-timeout=10
-bind-address=127.0.0.1
 
 log-bin-trust-function-creators=1
 key_buffer_size=            1M

mysql-test/lib/My/ConfigFactory.pm

@@ -169,6 +169,13 @@ sub fix_log {
   return "$dir/mysqld.log";
 }
 
+sub fix_bind_address {
+  if (IS_WINDOWS) {
+    return "*";
+  } else {
+    return "127.0.0.1";
+  }
+}
 sub fix_log_slow_queries {
   my ($self, $config, $group_name, $group)= @_;
   my $dir= dirname($group->value('datadir'));
@@ -251,6 +258,7 @@ my @mysqld_rules=
  { 'ssl-ca' => \&fix_ssl_ca },
  { 'ssl-cert' => \&fix_ssl_server_cert },
  { 'ssl-key' => \&fix_ssl_server_key },
+ { 'bind-address' => \&fix_bind_address },
   );
 
 if (IS_WINDOWS)