[C++] Optimize WordScanner with SSE4.2

before: 0.668325s
after:  0.260734s
diff --git a/Makefile.ckati b/Makefile.ckati
index 84dab33..cf5bab8 100644
--- a/Makefile.ckati
+++ b/Makefile.ckati
@@ -73,6 +73,7 @@
 
 KATI_CXXFLAGS := -g -W -Wall -MMD -MP
 KATI_CXXFLAGS += -O -DNOLOG
+KATI_CXXFLAGS += -march=native
 #KATI_CXXFLAGS += -pg
 
 ifeq ($(shell uname),Linux)