embedded library
some dirty places cleaned:

uint removed from mysql.h as Miguel suggested
empty_string renamed as my_empty_string to get rid of name's intersections
using embedded library


include/mysql.h:
  uint -> unsigned int
include/mysql_com.h:
  this caused warnings when not in expression
libmysqld/lib_sql.cc:
  uint -> unsigned int
sql-common/client.c:
  uint -> unsigned int
sql/item_strfunc.cc:
  empty_string -> my_empty_string
sql/mysql_priv.h:
  empty_string -> my_empty_string
sql/set_var.cc:
  empty_string -> my_empty_string
sql/sql_class.cc:
  empty_string -> my_empty_string
sql/sql_prepare.cc:
  net_flush ifdef-ed