Remove #define loop from util.h

Replace the loop macro with while (true). The #define caused
problems for Qt.

src/walletdb.cpp

@@ -73,7 +73,7 @@ void CWalletDB::ListAccountCreditDebit(const string& strAccount, list<CAccountin
     if (!pcursor)
         throw runtime_error("CWalletDB::ListAccountCreditDebit() : cannot create DB cursor");
     unsigned int fFlags = DB_SET_RANGE;
-    loop
+    while (true)
     {
         // Read next record
         CDataStream ssKey(SER_DISK, CLIENT_VERSION);
@@ -437,7 +437,7 @@ DBErrors CWalletDB::LoadWallet(CWallet* pwallet)
             return DB_CORRUPT;
         }
 
-        loop
+        while (true)
         {
             // Read next record
             CDataStream ssKey(SER_DISK, CLIENT_VERSION);