Include string.h in bflsc driver.

driver-bflsc.c

@@ -13,6 +13,7 @@
 #include <pthread.h>
 #include <stdint.h>
 #include <stdio.h>
+#include <string.h>
 #include <strings.h>
 #include <sys/time.h>
 #include <unistd.h>