embedded library
some fixes - cleanup procedure changed for embedded library - deletion of
embedded mysql->thd


include/mysql.h:
  free_embedded_thd added to the list of virtual methods
libmysqld/embedded_priv.h:
  function deleted
libmysqld/lib_sql.cc:
  function moved upper in file
sql-common/client.c:
  call of free_embedded_thd added