security: Fixing compilation errors and providing backward compatible interface for Signature*

This commit includes missed includes and "re-introduction" of
setKeyLocator method into Signature interface.  This method was used in
dependent applications as part of SignatureSha256With(Rsa|Ecdsa) data
structures.

Change-Id: I788f687600bb2729ea8265e23d4a31b990b8ed96
Refs: #1750, #1755
diff --git a/src/security/sec-tpm-osx.cpp b/src/security/sec-tpm-osx.cpp
index b805d4e..3064d84 100644
--- a/src/security/sec-tpm-osx.cpp
+++ b/src/security/sec-tpm-osx.cpp
@@ -34,6 +34,8 @@
 #include <stdlib.h>
 #include <string.h>
 
+#include <boost/lexical_cast.hpp>
+
 #include <CoreFoundation/CoreFoundation.h>
 #include <Security/Security.h>
 #include <Security/SecRandom.h>