Bugfix: Move boost/version include from db.cpp to walletdb.cpp where BOOST_VERSION is used

src/db.cpp

@@ -8,7 +8,6 @@
 #include "util.h"
 #include "hash.h"
 #include "addrman.h"
-#include <boost/version.hpp>
 #include <boost/filesystem.hpp>
 #include <boost/filesystem/fstream.hpp>
 #include <openssl/rand.h>

src/walletdb.cpp

@@ -5,6 +5,7 @@
 
 #include "walletdb.h"
 #include "wallet.h"
+#include <boost/version.hpp>
 #include <boost/filesystem.hpp>
 
 using namespace std;