include/my_global.h:
  do macro correctly
mysql-test/r/ctype_utf8.result:
  updated
mysql-test/r/myisam.result:
  updated
mysql-test/r/type_blob.result:
  updated
mysql-test/t/ctype_utf8.test:
  updated
mysql-test/t/type_blob.test:
  new tests
sql/share/english/errmsg.txt:
  specify that max key length is in BYTES
sql/share/russian/errmsg.txt:
  specify that max key length is in BYTES
sql/share/ukrainian/errmsg.txt:
  specify that max key length is in BYTES
sql/sql_table.cc:
  if a key length exceeds the supported maximum and it is safe to auto-decrease it, do it.
  cleanup