There is actually one extra byte for the 11th character, however it seems
to be meant for the '\0' terminating byte in the DBF specifications.
Also, the third party software (e.g. OpenOffice) do not correctly open
tables with column length=11.

modified:
  mysql-test/suite/connect/r/dbf.result
  mysql-test/suite/connect/t/dbf.test
  storage/connect/ha_connect.cc