clean up txmempool includes

Author: glozow

src/txmempool.cpp

@@ -5,6 +5,7 @@
 
 #include <txmempool.h>
 
+#include <chain.h>
 #include <coins.h>
 #include <consensus/consensus.h>
 #include <consensus/tx_verify.h>

src/txmempool.h

@@ -14,7 +14,6 @@
 #include <utility>
 #include <vector>
 
-#include <chain.h>
 #include <coins.h>
 #include <consensus/amount.h>
 #include <indirectmap.h>
@@ -26,12 +25,13 @@
 #include <util/epochguard.h>
 #include <util/hasher.h>
 
-#include <boost/multi_index_container.hpp>
 #include <boost/multi_index/hashed_index.hpp>
 #include <boost/multi_index/ordered_index.hpp>
 #include <boost/multi_index/sequenced_index.hpp>
+#include <boost/multi_index_container.hpp>
 
 class CBlockIndex;
+class CChain;
 class CChainState;
 extern RecursiveMutex cs_main;