10.6+ already unmasked.
Tested on 10.4 and 10.5 and passes on all 3 tests now occur with
particular attention to the causing MDEVs:

- MDEV-19511 Big endian issue in libmariadb
  -  has been resolved;
- CONC-208 Client tests (main.mysql_client_test, main.mysql_client_test_nonblock, main.mysql_client_test_comp) fail in buildbot on Power
  - observed passing in 10.5
- MDEV-19369 main.mysql_client_test, main.mysql_client_test_comp failed on ASAN build with error: 5888, status: 23, errno: 2
  - passing on ASAN builder