MDEV-23326: fix - not embedded main.mysql_tzinfo_to_sql_symlink

Because this test uses a unix socket to check if the
mysql_tzinfo_to_sql generates suitable SQL it cannot work in
embedded mode.

mysql-test/main/mysql_tzinfo_to_sql_symlink.test

 --source include/have_symlink.inc
 --source include/not_windows.inc
+--source include/not_embedded.inc
 
 use mysql;
 RENAME TABLE time_zone TO time_zone_orig,