Increase ARENA_FILE_VERSION.
Commit changed the layout of structures that make old files incompatible.
@@ -47,7 +47,7 @@ SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// address within the relocated arena.
#define ARENA_FLAGS_RELOCATABLE 2
-#define ARENA_FILE_VERSION ((16 << 16) | MAX_THREADS)
+#define ARENA_FILE_VERSION ((17 << 16) | MAX_THREADS)
#define EOL ((size_t) -1)
