MDEV-11597 Assertion when doing select from virtual column with impossible value

- Changed error handlers interface so that they can change error level in
  the handler
- Give warnings and errors when calculating virtual columns
- On insert/update error is fatal in strict mode.
- SELECT and DELETE will only give a warning if a virtual field generates an error
- Added VCOL_UPDATE_FOR_DELETE and VCOL_UPDATE_INDEX_FOR_REPLACE to be able to
  easily detect in update_virtual_fields() if we should use an error
  handler to mask errors or not.

sql/sql_acl.cc

@@ -10155,7 +10155,7 @@ public:
   virtual bool handle_condition(THD *thd,
                                 uint sql_errno,
                                 const char* sqlstate,
-                                Sql_condition::enum_warning_level level,
+                                Sql_condition::enum_warning_level *level,
                                 const char* msg,
                                 Sql_condition ** cond_hdl);
 
@@ -10170,12 +10170,12 @@ Silence_routine_definer_errors::handle_condition(
   THD *thd,
   uint sql_errno,
   const char*,
-  Sql_condition::enum_warning_level level,
+  Sql_condition::enum_warning_level *level,
   const char* msg,
   Sql_condition ** cond_hdl)
 {
   *cond_hdl= NULL;
-  if (level == Sql_condition::WARN_LEVEL_ERROR)
+  if (*level == Sql_condition::WARN_LEVEL_ERROR)
   {
     switch (sql_errno)
     {