Fix ios compile

Summary: We need to set contbuild for this :)

Test Plan: compiles

Reviewers: sdong, yhchiang, ljin

Reviewed By: ljin

Subscribers: leveldb

Differential Revision: https://reviews.facebook.net/D22701

db/internal_stats.cc

@@ -257,9 +257,11 @@ bool InternalStats::GetIntProperty(DBPropertyType property_type,
                cfd_->imm()->current()->GetTotalNumEntries() +
                current->GetEstimatedActiveKeys();
       return true;
+#ifndef ROCKSDB_LITE
     case kIsFileDeletionEnabled:
       *value = db->IsFileDeletionsEnabled();
       return true;
+#endif
     default:
       return false;
   }

table/block_builder.h

@@ -50,7 +50,7 @@ class BlockBuilder {
 
  private:
   const int          block_restart_interval_;
-  const Comparator*  comparator_;
+  const Comparator* comparator_ __attribute__((unused));  // only used in assert
 
   std::string           buffer_;    // Destination buffer
   std::vector<uint32_t> restarts_;  // Restart points