Remove MYSQL_ENCRYPTION.

MariaDB will likely never support MySQL-style encryption for
InnoDB, because we cannot link with the Oracle encryption plugin.
This is preparation for merging MDEV-11623.

storage/innobase/btr/btr0btr.cc

@@ -336,9 +336,7 @@ btr_root_adjust_on_import(
 			/* Check that the table flags and the tablespace
 			flags match. */
 			ulint	flags = dict_tf_to_fsp_flags(
-				table->flags,
-				false,
-				dict_table_is_encrypted(table));
+				table->flags, false);
 			ulint	fsp_flags = fil_space_get_flags(table->space);
 			err = fsp_flags_are_equal(flags, fsp_flags)
 			      ? DB_SUCCESS : DB_CORRUPTION;

storage/innobase/dict/dict0crea.cc

@@ -494,11 +494,9 @@ dict_build_tablespace_for_table(
 
 		/* Determine the tablespace flags. */
 		bool	is_temp = dict_table_is_temporary(table);
-		bool	is_encrypted = dict_table_is_encrypted(table);
 		bool	has_data_dir = DICT_TF_HAS_DATA_DIR(table->flags);
 		ulint	fsp_flags = dict_tf_to_fsp_flags(table->flags,
-							 is_temp,
-							 is_encrypted);
+							 is_temp);
 
 		/* Determine the full filepath */
 		if (is_temp) {

storage/innobase/dict/dict0dict.cc

@@ -7255,13 +7255,11 @@ dict_table_t::flags |     0     |    1    |     1      |    1
 fil_space_t::flags  |     0     |    0    |     1      |    1
 @param[in]	table_flags	dict_table_t::flags
 @param[in]	is_temp		whether the tablespace is temporary
-@param[in]	is_encrypted	whether the tablespace is encrypted
 @return tablespace flags (fil_space_t::flags) */
 ulint
 dict_tf_to_fsp_flags(
 	ulint	table_flags,
-	bool	is_temp,
-	bool	is_encrypted)
+	bool	is_temp)
 {
 	DBUG_EXECUTE_IF("dict_tf_to_fsp_flags_failure",
 			return(ULINT_UNDEFINED););
@@ -7289,8 +7287,7 @@ dict_tf_to_fsp_flags(
 						   is_temp,
 						   0,
 						   0,
-						   0,
-						   is_encrypted);
+						   0);
 
 	/* In addition, tablespace flags also contain if the page
 	compression is used for this table. */

storage/innobase/dict/dict0load.cc

@@ -1453,10 +1453,7 @@ dict_check_sys_tables(
 
 		/* Check that the .ibd file exists. */
 		bool	is_temp = flags2 & DICT_TF2_TEMPORARY;
-		bool	is_encrypted = flags2 & DICT_TF2_ENCRYPTION;
-		ulint	fsp_flags = dict_tf_to_fsp_flags(flags,
-							 is_temp,
-							 is_encrypted);
+		ulint	fsp_flags = dict_tf_to_fsp_flags(flags, is_temp);
 		validate = true; /* Encryption */
 
 		dberr_t	err = fil_ibd_open(
@@ -2991,9 +2988,7 @@ dict_load_tablespace(
 
 	/* Try to open the tablespace.  We set the 2nd param (fix_dict) to
 	false because we do not have an x-lock on dict_operation_lock */
-	ulint fsp_flags = dict_tf_to_fsp_flags(table->flags,
-					       false,
-					       dict_table_is_encrypted(table));
+	ulint fsp_flags = dict_tf_to_fsp_flags(table->flags, false);
 	dberr_t err = fil_ibd_open(
 		true, false, FIL_TYPE_TABLESPACE, table->space,
 		fsp_flags, space_name, filepath, table);