Fix these warnings with NX_DEBUG_INPUT enabled:

NXdispatch.c: In function ‘Dispatch’:
NXdispatch.c:350:74: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘CARD32’ {aka ‘unsigned int’} [-Wformat=]
           fprintf(stderr, "Session: Session started at '%s' timestamp [%lu].\n",
                                                                        ~~^
                                                                        %u
                       GetTimeAsString(), GetTimeInMillis());

Reconnect.c: In function ‘nxagentHandleConnectionStates’:
Reconnect.c:303:74: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘CARD32’ {aka ‘unsigned int’} [-Wformat=]
         fprintf(stderr, "Session: Session suspended at '%s' timestamp [%lu].\n", GetTimeAsString(), GetTimeInMillis());
                                                                        ~~^                          ~~~~~~~~~~~~~~~~~
                                                                        %u
Reconnect.c: In function ‘nxagentReconnectSession’:
Reconnect.c:673:66: warning: format ‘%lu’ expects argument of type ‘long unsigned int’, but argument 4 has type ‘CARD32’ {aka ‘unsigned int’} [-Wformat=]
   fprintf(stderr, "Session: Session resumed at '%s' timestamp [%lu].\n", GetTimeAsString(), GetTimeInMillis());
                                                                ~~^                          ~~~~~~~~~~~~~~~~~
                                                                %u