Removing the binlog-show-xid option as it was only a temporary solution until we have replace-regex which we have now.
That option was used to suppress the XID from the output of SHOW BINLOG EVENTS (to create a repeatable testsuite),
was available only in debug builds, and was explicitely marked as "may be removed in future versions" in mysqld --help.
Idea of the removal approved by the replication team.