fix(server): fix to compile server without pubsub sources when pubsub is disabled
fix(server): fix to compile server without pubsub sources when pubsub is disabled

JGrothoff/open62541,jpfr/open62541,open62541/open62541,jpfr/open62541,open62541/open62541,open62541/open62541,jpfr/open62541,JGrothoff/open62541,JGrothoff/open62541,jpfr/open62541,open62541/open62541,JGrothoff/open62541