Problem with NOT LIKE queries.
  modified:   storage/connect/ha_connect.cc
  modified:   sql/item_cmpfunc.h

- Fix MDEV-21084
  Misusage of strncat could cause buffer overflow.
  modified:   storage/connect/reldef.cpp
  modified:   storage/connect/tabcmg.cpp
  modified:   storage/connect/tabjson.cpp
  modified:   storage/connect/tabrest.cpp
  modified:   storage/connect/tabxml.cpp