MDEV-4786 merge 10.0-monty -> 10.0

remove unused HA_CAN_EXPORT
(with the merge of "FLUSH TABLE <table_list> FOR EXPORT",
this functionality should be added back, but differently -
no table flag, handler::extra() returns an error instead)

sql/handler.h

@@ -255,12 +255,6 @@ enum enum_alter_inplace_result {
  */
 #define HA_READ_OUT_OF_SYNC              (1LL << 45)
 
-/*
-  Storage engine supports table export using the
-  FLUSH TABLE <table_list> FOR EXPORT statement.
- */
-#define HA_CAN_EXPORT                 (1LL << 46)
-
 /*
   Set of all binlog flags. Currently only contain the capabilities
   flags.

storage/innobase/handler/ha_innodb.cc

@@ -2190,7 +2190,7 @@ ha_innobase::ha_innobase(
 		  HA_BINLOG_ROW_CAPABLE |
 		  HA_CAN_GEOMETRY | HA_PARTIAL_COLUMN_READ |
 		  HA_TABLE_SCAN_ON_INDEX | HA_CAN_FULLTEXT |
-		  HA_CAN_FULLTEXT_EXT | HA_CAN_EXPORT),
+		  HA_CAN_FULLTEXT_EXT),
 	start_of_scan(0),
 	num_write_row(0)
 {}