Ticket #1084: pubsub server sample: minor fix for static config
Fix following issue when WITH_STATIC_SECURITY_DATA
is set:
/builds/systerel/S2OPC/samples/PubSub_ClientServer/pubsub_server/server.c:103:13: error: 'SOPC_TestHelper_AskPass_FromEnv' defined but not used [-Werror=unused-function]