cls/journal/cls_journal: add missing include

Signed-off-by: Max Kellermann <[email protected]>

Author: MaxKellermann

src/cls/journal/cls_journal.cc

@@ -4,6 +4,7 @@
 #include "include/int_types.h"
 #include "include/buffer.h"
 #include "include/encoding.h"
+#include "include/intarith.h" // for round_up_to()
 #include "common/errno.h"
 #include "objclass/objclass.h"
 #include "cls/journal/cls_journal_types.h"