there was an error about sendind prepared parameters to the server


libmysqld/lib_sql.cc:
  parameter's length added as a parameter
sql/ha_berkeley.cc:
  these lines sometimes crashes in embedded library
  so i #ifdef-ed it
sql/item.h:
  add the data_len parameter in the embedded case
sql/sql_prepare.cc:
  i added macroses to make headers of store_param_xxx functions
  they have different number of parameters in standalone an embedded servers
  also get_param_length now is implemented differently in embedded server