include/mysql.h:
  add mysql_stmt_reset prototype
include/mysql_com.h:
  add COM_STMT_RESET
libmysql/libmysql.def:
  Add mysql_stmt_reset def
sql/sql_prepare.cc:
  Fix selects hang after windows slowdown issue fix (send_fields)
sql/sql_parse.cc:
  Add COM_STMT_RESET
sql/mysql_priv.h:
  add defination of mysql_stmt_reset