Fix warnings about invalid API function 'icinga::Hello'

fixes #9884

lib/remote/apilistener.cpp

@@ -22,6 +22,7 @@
 #include "remote/jsonrpcconnection.hpp"
 #include "remote/endpoint.hpp"
 #include "remote/jsonrpc.hpp"
+#include "remote/apifunction.hpp"
 #include "base/convert.hpp"
 #include "base/netstring.hpp"
 #include "base/json.hpp"
@@ -43,6 +44,8 @@ boost::signals2::signal<void(bool)> ApiListener::OnMasterChanged;
 
 REGISTER_STATSFUNCTION(ApiListenerStats, &ApiListener::StatsFunc);
 
+REGISTER_APIFUNCTION(Hello, icinga, &ApiListener::HelloAPIHandler);
+
 ApiListener::ApiListener(void)
 	: m_LogMessageCount(0)
 { }
@@ -922,3 +925,8 @@ std::set<HttpConnection::Ptr> ApiListener::GetHttpClients(void) const
 	ObjectLock olock(this);
 	return m_HttpClients;
 }
+
+Value ApiListener::HelloAPIHandler(const MessageOrigin& origin, const Dictionary::Ptr& params)
+{
+	return Empty;
+}

lib/remote/apilistener.hpp

@@ -75,6 +75,7 @@ public:
 
 	static Value ConfigUpdateHandler(const MessageOrigin& origin, const Dictionary::Ptr& params);
 
+	static Value HelloAPIHandler(const MessageOrigin& origin, const Dictionary::Ptr& params);
 protected:
 	virtual void OnConfigLoaded(void);
 	virtual void OnAllConfigLoaded(void);