MDEV-8580 For some BOOLEAN or ENUM sysvars list of valid values is not generated

set the 'typelib' member for plugin boolean sysvars

mysql-test/suite/sys_vars/r/sysvars_aria.result

@@ -54,7 +54,7 @@ VARIABLE_COMMENT	Encrypt tables (only for tables with ROW_FORMAT=PAGE (default)
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL
-ENUM_VALUE_LIST	NULL
+ENUM_VALUE_LIST	OFF,ON
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	OPTIONAL
 VARIABLE_NAME	ARIA_FORCE_START_AFTER_RECOVERY_FAILURES
@@ -208,7 +208,7 @@ VARIABLE_COMMENT	Maintain page checksums (can be overridden per table with PAGE_
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL
-ENUM_VALUE_LIST	NULL
+ENUM_VALUE_LIST	OFF,ON
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	ARIA_RECOVER
@@ -292,6 +292,6 @@ VARIABLE_COMMENT	Whether temporary tables should be MyISAM or Aria
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL
-ENUM_VALUE_LIST	NULL
+ENUM_VALUE_LIST	OFF,ON
 READ_ONLY	YES
 COMMAND_LINE_ARGUMENT	NULL

mysql-test/suite/sys_vars/r/sysvars_server_notembedded.result

@@ -230,7 +230,7 @@ VARIABLE_COMMENT	Run fast part of group commit in a single thread, to optimize k
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL
-ENUM_VALUE_LIST	NULL
+ENUM_VALUE_LIST	OFF,ON
 READ_ONLY	YES
 COMMAND_LINE_ARGUMENT	REQUIRED
 VARIABLE_NAME	BINLOG_ROW_IMAGE
@@ -2470,7 +2470,7 @@ VARIABLE_COMMENT	Use memory mapping for reading and writing MyISAM tables
 NUMERIC_MIN_VALUE	NULL
 NUMERIC_MAX_VALUE	NULL
 NUMERIC_BLOCK_SIZE	NULL
-ENUM_VALUE_LIST	NULL
+ENUM_VALUE_LIST	OFF,ON
 READ_ONLY	NO
 COMMAND_LINE_ARGUMENT	NONE
 VARIABLE_NAME	MYSQL56_TEMPORAL_FORMAT

sql/sql_plugin.cc

@@ -3575,6 +3575,7 @@ void plugin_opt_set_limits(struct my_option *options,
   case PLUGIN_VAR_BOOL:
     options->var_type= GET_BOOL;
     options->def_value= ((sysvar_bool_t*) opt)->def_val;
+    options->typelib= &bool_typelib;
     break;
   case PLUGIN_VAR_STR:
     options->var_type= ((opt->flags & PLUGIN_VAR_MEMALLOC) ?
@@ -3623,6 +3624,7 @@ void plugin_opt_set_limits(struct my_option *options,
   case PLUGIN_VAR_BOOL | PLUGIN_VAR_THDLOCAL:
     options->var_type= GET_BOOL;
     options->def_value= ((thdvar_bool_t*) opt)->def_val;
+    options->typelib= &bool_typelib;
     break;
   case PLUGIN_VAR_STR | PLUGIN_VAR_THDLOCAL:
     options->var_type= ((opt->flags & PLUGIN_VAR_MEMALLOC) ?