this fixes a weird failure mode on chris's ppc
this fixes a weird failure mode on chris's ppc

the linker on ppc behaves a little differently when two components define the
same data with extern linkage.  -Bsymbolic fixes this, and doesn't seem to
cause any harm on my intel system

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