Added defines for mysqld_error_find_printf_error_used

This is to make it easier to use the
create_mysqld_error_find_printf_error tool to find wrong print

sql/sql_class.h

@@ -4163,6 +4163,11 @@ class THD :public Statement,
   {
     parse_error(ER_SYNTAX_ERROR);
   }
+#ifdef mysqld_error_find_printf_error_used
+  void parse_error(const char *t)
+  {
+  }
+#endif
 private:
   /*
     Only the implementation of the SIGNAL and RESIGNAL statements

sql/unireg.h

@@ -56,6 +56,7 @@
 #endif
 #define ER_THD_OR_DEFAULT(thd,X) ((thd) ? ER_THD(thd, (X)) : ER_DEFAULT(X))
 
+
 #define ME_INFO (ME_HOLDTANG | ME_NOREFRESH)
 #define ME_ERROR (ME_BELL | ME_NOREFRESH)
 #define MYF_RW MYF(MY_WME+MY_NABP)		/* Vid my_read & my_write */