fixed msvc build

mix/HttpServer.cpp

@@ -72,7 +72,7 @@ void HttpServer::setPort(int _port)
 
 QString HttpServer::errorString() const
 {
-	return this->errorString();
+	return QTcpServer::errorString();
 }
 
 void HttpServer::setListen(bool _listen)

mix/QContractDefinition.cpp

@@ -45,7 +45,7 @@ QContractDefinition::QContractDefinition(dev::solidity::ContractDefinition const
 }
 
 
-QFunctionDefinition* QContractDefinition::getFunction(FixedHash<4> _hash)
+QFunctionDefinition* QContractDefinition::getFunction(dev::FixedHash<4> _hash)
 {
 	if (m_constructor->hash() == _hash)
 		return m_constructor;

mix/QContractDefinition.h

@@ -47,7 +47,7 @@ public:
 	QFunctionDefinition* constructor() const { return m_constructor; }
 	QList<QFunctionDefinition*> const& functionsList() const { return m_functions; }
 	/// Find function by hash, returns nullptr if not found
-	QFunctionDefinition* getFunction(FixedHash<4> _hash);
+	QFunctionDefinition* getFunction(dev::FixedHash<4> _hash);
 private:
 	QList<QFunctionDefinition*> m_functions;
 	QFunctionDefinition* m_constructor;