Fix build issue with MySQL 8

Fix build issue with MySQL 8

Origin: other, https://bugs.launchpad.net/ubuntu/+source/trafficserver/+bug/1795362
Forwarded: https://github.com/apache/trafficserver/pull/4360
Applied-Upstream: https://github.com/apache/trafficserver/commit/05b30527974416768515506f69da338652c23260
Reviewed-by: Jean Baptiste Favre <debian@jbfavre.org>
Last-Update: 2018-10-06

The my_bool type is no longer used in MySQL source code.
Any third-party code that used this type to represent C
boolean variables should use the bool or int C type instead.
Last-Update: 2018-10-06
Gbp-Pq: Name 0009-fix-mysql-8-build.patch