adding test
field.cc:
  bug#10714 Inserting double value into utf8 column crashes server:
  sprintf was executed with too big length, which caused
  crash on some Windows platforms.


sql/field.cc:
  bug#10714 Inserting double value into utf8 column crashes server
  sprintf was executed with too long length, which cau
  crashe on Windows.
mysql-test/t/ctype_utf8.test:
  adding test
mysql-test/r/ctype_utf8.result:
  adding test