Add function to header file

src/driver/drv_ntp.h

@@ -12,6 +12,7 @@ unsigned int NTP_GetCurrentTimeWithoutOffset();
 void NTP_AppendInformationToHTTPIndexPage(http_request_t* request);
 bool NTP_IsTimeSynced();
 int NTP_GetTimesZoneOfsSeconds();
+void NTP_SetTimesZoneOfsSeconds(int o);
 // for Simulator only, on Windows, for unit testing
 void NTP_SetSimulatedTime(unsigned int timeNow);