mariadb: bump to 10.2.24

mariadb: bump to 10.2.24

From Release Notes:

  Security

    MDEV-18686 - Add option to PAM authentication plugin to allow case insensitive username matching
    bugfix - multi-update checked privileges on views incorrectly (commit 5057d4637525eadad438d25ee6a4870a4e6b384c)
    MDEV-19276 - during connect, write error log warning for ER_DBACCESS_DENIED_ERROR, if log_warnings > 1
    MDEV-17456 - Malicious SUPER user can possibly change audit log configuration without leaving traces.

    Fixes for the following security vulnerabilities:
        CVE-2019-2614
        CVE-2019-2627
        CVE-2019-2628

OpenWrt changes:

  - added PKG_CPE_ID
  - shortened default description to make "opkg info" output easier on the eyes
  - refreshed patches

Signed-off-by: Sebastian Kemper <sebastian_ml@gmx.net>