Log Message:
Update databases/mariadb55* to 5.5.57.

MariaDB 5.5.57
- Bugfixes and updates, including from MySQL 5.5.57.
- Fixes for the following security vulnerabilities:
  - CVE-2017-3636
  - CVE-2017-3641
  - CVE-2017-3653

MariaDB 5.5.56
- Bugfixes and updates, including from MySQL 5.5.56.

MariaDB 5.5.55
- Bugfixes and updates, including from MySQL 5.5.55.
- MDEV-11027: better InnoDB crash recovery progress reporting
- MDEV-11520: improvements to how InnoDB data files are extended
- MDEV-6143: the various MariaDB Linux binary tarballs will now untar
  to directories that match their filename
- Fixes for the following security vulnerabilities:
  - CVE-2017-3302
  - CVE-2017-3313
  - CVE-2017-3308
  - CVE-2017-3309
  - CVE-2017-3453
  - CVE-2017-3456
  - CVE-2017-3464

MariaDB 5.5.54
- Bugfixes and updates, including from MySQL 5.5.54.
- HeidiSQL updated to 9.4
- Fixes for the following security vulnerabilities:
  - CVE-2016-6664
  - CVE-2017-3238
  - CVE-2017-3243
  - CVE-2017-3244
  - CVE-2017-3258
  - CVE-2017-3265
  - CVE-2017-3291
  - CVE-2017-3312
  - CVE-2017-3317
  - CVE-2017-3318

MariaDB 5.5.53
- Bugfixes and updates, including from MySQL 5.5.53.
- XtraDB updated to 5.5.52-38.3
- Fixes for the following security vulnerabilities:
  - CVE-2016-7440
  - CVE-2016-5584
  - CVE-2016-5483 (re-issued later as CVE-2017-3600)
  - CVE-2017-3651