Spider waits until the server initialization has been completed
(i.e., mysqld_server_started has been set to 1) before creating the
Spider system tables. Spider also wait until the system tables have
been created before instantiating ha_spider.

These waits leads to dead lock when a non-system Spider table is
created by --in-file. This is because queries passed by --in-file
are executed during the server initialization and creating the
non-system Spider table causes an instantiation of ha_spider.

In the first place, there seems to be no need for Spider to do such
a synchronization. Thus, we simply remove the synchronization.