pack_length_in_rec() func has been introduced.


sql/field.h:
  A fix for bit type. 
  As from now the pack_length_in_rec() function is used for MyISAM 
  record length calculation instead of the pack_length().
  For bit field it doesn't count uneven bits.
sql/ha_myisam.cc:
  A fix for bit type. 
  As from now the pack_length_in_rec() function is used for MyISAM 
  record length calculation instead of the pack_length().
  For bit field it doesn't count uneven bits.