packages mariadb-server-10.1: change the value of "enable_apt?" to true
packages mariadb-server-10.1: change the value of "enable_apt?" to true

Because if we set false in "enable_apt?", the change log for debian
doesn't update.

Then the version of the source archive (mariadb-server-10.1-mroonga-x.x.tar.gz)
doesn't also change.
Because this version refer to the version of the change log for debian.

mroonga/mroonga,mroonga/mroonga,mroonga/mroonga,mroonga/mroonga