Remove unreferenced boost headers

Author: murrayn

src/fs.h

@@ -12,7 +12,6 @@
 #endif
 
 #include <boost/filesystem.hpp>
-#include <boost/filesystem/fstream.hpp>
 
 /** Filesystem operations and types */
 namespace fs = boost::filesystem;

src/interfaces/node.cpp

@@ -35,7 +35,6 @@
 #endif
 
 #include <atomic>
-#include <boost/thread/thread.hpp>
 #include <univalue.h>
 
 class CWallet;

src/rpc/blockchain.cpp

@@ -38,7 +38,6 @@
 
 #include <univalue.h>
 
-#include <boost/algorithm/string.hpp>
 #include <boost/thread/thread.hpp> // boost::thread::interrupt
 
 #include <memory>

src/rpc/util.h

@@ -9,8 +9,6 @@
 #include <script/standard.h>
 #include <univalue.h>
 
-#include <boost/variant/static_visitor.hpp>
-
 #include <string>
 #include <vector>
 

src/util/system.cpp

@@ -73,7 +73,6 @@
 #include <malloc.h>
 #endif
 
-#include <boost/thread.hpp>
 #include <openssl/crypto.h>
 #include <openssl/rand.h>
 #include <openssl/conf.h>