refs #6089 build handlerton without 5.6 alter table if we want

git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@54823 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/ha_tokudb_alter_55.cc

 #if TOKU_INCLUDE_ALTER_55
 
+#include "ha_tokudb_alter_common.cc"
+
 bool ha_tokudb::try_hot_alter_table() {
     TOKUDB_DBUG_ENTER("try_hot_alter_table");
     THD *thd = ha_thd();