Revert "Added -O2 option for gcc debug build"
Revert "Added -O2 option for gcc debug build"

This reverts commit f7322cc40b87efc8d533d44b1b831962cb1dbc73.

MariaDB/mariadb-connector-c,ottok/mariadb-connector-c,ottok/mariadb-connector-c,MariaDB/mariadb-connector-c,MariaDB/mariadb-connector-c,ottok/mariadb-connector-c