Fix vpwallets compile error

src/main.cpp

@@ -28,6 +28,7 @@
 #include "util.h"
 #include "utilmoneystr.h"
 #include "validationinterface.h"
+#include "wallet/wallet.h"
 #include "wallet/asyncrpcoperation_sendmany.h"
 #include "wallet/asyncrpcoperation_shieldcoinbase.h"
 

src/wallet/wallet.cpp

@@ -37,6 +37,7 @@ unsigned int nTxConfirmTarget = DEFAULT_TX_CONFIRM_TARGET;
 bool bSpendZeroConfChange = true;
 bool fSendFreeTransactions = false;
 bool fPayAtLeastCustomFee = true;
+std::vector<CWalletRef> vpwallets;
 
 /**
  * Fees smaller than this (in satoshi) are considered zero fee (for transaction creation)