delete references to INC_DIR, a vestige of the old build system
delete references to INC_DIR, a vestige of the old build system

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