Add the innodb_plugin tests to "make dist".

mysql-test/Makefile.am

@@ -100,6 +100,8 @@ TEST_DIRS = t r include std_data std_data/parts collections \
 	suite/rpl_ndb suite/rpl_ndb/t suite/rpl_ndb/r \
 	suite/parts suite/parts/t suite/parts/r suite/parts/inc \
 	suite/innodb suite/innodb/t suite/innodb/r suite/innodb/include \
+	suite/innodb_plugin suite/innodb_plugin/t suite/innodb_plugin/r \
+	suite/innodb_plugin/include \
 	suite/engines suite/engines/funcs suite/engines/iuds suite/engines/rr_trx \
 	suite/engines/funcs/r suite/engines/funcs/t suite/engines/iuds/r \
 	suite/engines/iuds/t suite/engines/rr_trx/include suite/engines/rr_trx/r \