Fix two clang3.3 warnings

src/main.cpp

@@ -93,15 +93,6 @@ void UnregisterWallet(CWallet* pwalletIn)
     }
 }
 
-// check whether the passed transaction is from us
-bool static IsFromMe(CTransaction& tx)
-{
-    BOOST_FOREACH(CWallet* pwallet, setpwalletRegistered)
-        if (pwallet->IsFromMe(tx))
-            return true;
-    return false;
-}
-
 // get the wallet transaction with the given hash (if it exists)
 bool static GetTransaction(const uint256& hashTx, CWalletTx& wtx)
 {

src/main.h

@@ -106,7 +106,7 @@ static const uint64 nMinDiskSpace = 52428800;
 class CReserveKey;
 class CCoinsDB;
 class CBlockTreeDB;
-class CDiskBlockPos;
+struct CDiskBlockPos;
 class CCoins;
 class CTxUndo;
 class CCoinsView;