fix warning when building non-RT version
fix warning when building non-RT version

bobvanderlinden/machinekit,ikcalB/linuxcnc-mirror,araisrobo/linuxcnc,ArcEye/MK-Qt5,mhaberler/machinekit,cnc-club/linuxcnc,unseenlaser/machinekit,araisrobo/linuxcnc,kinsamanka/machinekit,cdsteinkuehler/linuxcnc,strahlex/machinekit,ianmcmahon/linuxcnc-mirror,Cid427/machinekit,unseenlaser/linuxcnc,bmwiedemann/linuxcnc-mirror,ArcEye/machinekit-testing,cnc-club/linuxcnc,unseenlaser/linuxcnc,yishinli/emc2,ikcalB/linuxcnc-mirror,EqAfrica/machinekit,kinsamanka/machinekit,Cid427/machinekit,RunningLight/machinekit,unseenlaser/linuxcnc,unseenlaser/machinekit,EqAfrica/machinekit,cnc-club/linuxcnc,araisrobo/machinekit,strahlex/machinekit,ArcEye/machinekit-testing,araisrobo/linuxcnc,kinsamanka/machinekit,unseenlaser/linuxcnc,strahlex/machinekit,jaguarcat79/ILC-with-LinuxCNC,narogon/linuxcnc,bobvanderlinden/machinekit,yishinli/emc2,narogon/linuxcnc,araisrobo/machinekit,jaguarcat79/ILC-with-LinuxCNC,bmwiedemann/linuxcnc-mirror,kinsamanka/machinekit,yishinli/emc2,mhaberler/machinekit,strahlex/machinekit,jaguarcat79/ILC-with-LinuxCNC,kinsamanka/machinekit,araisrobo/machinekit,kinsamanka/machinekit,aschiffler/linuxcnc,cdsteinkuehler/linuxcnc,RunningLight/machinekit,bmwiedemann/linuxcnc-mirror,EqAfrica/machinekit,ArcEye/MK-Qt5,unseenlaser/linuxcnc,bmwiedemann/linuxcnc-mirror,ianmcmahon/linuxcnc-mirror,narogon/linuxcnc,unseenlaser/machinekit,ianmcmahon/linuxcnc-mirror,ArcEye/machinekit-testing,strahlex/machinekit,ArcEye/MK-Qt5,jaguarcat79/ILC-with-LinuxCNC,ikcalB/linuxcnc-mirror,ArcEye/machinekit-testing,araisrobo/machinekit,EqAfrica/machinekit,araisrobo/machinekit,bmwiedemann/linuxcnc-mirror,aschiffler/linuxcnc,cdsteinkuehler/MachineKit,aschiffler/linuxcnc,yishinli/emc2,bmwiedemann/linuxcnc-mirror,araisrobo/machinekit,bobvanderlinden/machinekit,ianmcmahon/linuxcnc-mirror,cdsteinkuehler/linuxcnc,ArcEye/machinekit-testing,Cid427/machinekit,ArcEye/MK-Qt5,unseenlaser/machinekit,cdsteinkuehler/MachineKit,cnc-club/linuxcnc,mhaberler/machinekit,EqAfrica/machinekit,bobvanderlinden/machinekit,ianmcmahon/linuxcnc-mirror,ArcEye/machinekit-testing,kinsamanka/machinekit,ianmcmahon/linuxcnc-mirror,ikcalB/linuxcnc-mirror,jaguarcat79/ILC-with-LinuxCNC,strahlex/machinekit,RunningLight/machinekit,strahlex/machinekit,cdsteinkuehler/MachineKit,Cid427/machinekit,cdsteinkuehler/MachineKit,narogon/linuxcnc,bobvanderlinden/machinekit,mhaberler/machinekit,RunningLight/machinekit,araisrobo/machinekit,ArcEye/machinekit-testing,aschiffler/linuxcnc,bobvanderlinden/machinekit,aschiffler/linuxcnc,cnc-club/linuxcnc,cnc-club/linuxcnc,cdsteinkuehler/linuxcnc,Cid427/machinekit,unseenlaser/machinekit,RunningLight/machinekit,EqAfrica/machinekit,araisrobo/linuxcnc,cdsteinkuehler/linuxcnc,ikcalB/linuxcnc-mirror,cdsteinkuehler/linuxcnc,ArcEye/MK-Qt5,unseenlaser/machinekit,EqAfrica/machinekit,RunningLight/machinekit,ikcalB/linuxcnc-mirror,cdsteinkuehler/MachineKit,bobvanderlinden/machinekit,bobvanderlinden/machinekit,kinsamanka/machinekit,mhaberler/machinekit,cdsteinkuehler/MachineKit,araisrobo/machinekit,cnc-club/linuxcnc,araisrobo/machinekit,EqAfrica/machinekit,unseenlaser/machinekit,bmwiedemann/linuxcnc-mirror,mhaberler/machinekit,Cid427/machinekit,ikcalB/linuxcnc-mirror,RunningLight/machinekit,narogon/linuxcnc,ArcEye/machinekit-testing,RunningLight/machinekit,araisrobo/linuxcnc,ArcEye/MK-Qt5,mhaberler/machinekit,ianmcmahon/linuxcnc-mirror,unseenlaser/machinekit,Cid427/machinekit,ArcEye/MK-Qt5,mhaberler/machinekit,ArcEye/MK-Qt5,Cid427/machinekit