[C++] Add a benchmark for WordScanner::Split
diff --git a/Makefile.ckati b/Makefile.ckati
index e3361d8..84dab33 100644
--- a/Makefile.ckati
+++ b/Makefile.ckati
@@ -57,7 +57,9 @@
 	version.cc
 
 KATI_CXX_SRCS := $(addprefix $(KATI_SRC_PATH)/,$(KATI_CXX_SRCS))
-KATI_CXX_TEST_SRCS:= $(wildcard $(KATI_SRC_PATH)/*_test.cc)
+KATI_CXX_TEST_SRCS := \
+  $(wildcard $(KATI_SRC_PATH)/*_test.cc) \
+  $(wildcard $(KATI_SRC_PATH)/*_bench.cc)
 
 KATI_CXX_OBJS := $(patsubst $(KATI_SRC_PATH)/%.cc,$(KATI_INTERMEDIATES_PATH)/%.o,\
 	$(KATI_CXX_SRCS))