sstables/size_tiered_compaction_strategy.hh: make self-sufficient
sstables/size_tiered_compaction_strategy.hh: make self-sufficient

scylladb/scylla,scylladb/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,avikivity/scylla,avikivity/scylla