package/mariadb: bump version to 10.3.30

package/mariadb: bump version to 10.3.30

- rebase 001-add-extra-check-for-librt.patch
- for changelog see [1], [2]

Fixes:

  CMake Error at libmariadb/cmake/ConnectorName.cmake:30 (ENDMACRO):
    Flow control statements are not properly nested.
  Call Stack (most recent call first):
    libmariadb/CMakeLists.txt:423 (INCLUDE)

[1] https://mariadb.com/kb/en/mariadb-10329-changelog/
[2] https://mariadb.com/kb/en/mariadb-10330-changelog/

Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>