"You can always mysql_real_query a query with placeholders 
after mysql_prepare()"


sql/sql_class.cc:
  prepare_command removed
sql/sql_class.h:
  prepare_command removed
sql/sql_prepare.cc:
  prepare_command removed
sql/sql_yacc.yy:
  prepare_command removed
tests/client_test.c:
  added test for bug #1946: "You can always
  mysql_real_query a query with placeholders after mysql_prepare()"