Add missing include.

Change-Id: Ib49de848de49e3a4304b333d8c17d03299c048ba
diff --git a/keystore-engine/keyhandle.cpp b/keystore-engine/keyhandle.cpp
index 1799735..aeba896 100644
--- a/keystore-engine/keyhandle.cpp
+++ b/keystore-engine/keyhandle.cpp
@@ -25,6 +25,8 @@
 
 #include <openssl/engine.h>
 
+#include <string.h>
+
 /**
  * Makes sure the ex_data for the keyhandle is initially set to NULL.
  */