dont hard code libvortex path

lib/CL/devices/vortex/CMakeLists.txt

@@ -34,6 +34,7 @@ add_pocl_device_library("pocl-devices-vortex" pocl-vortex.c pocl-vortex.h vortex
 
 if(ENABLE_LOADABLE_DRIVERS)
   target_link_libraries(pocl-devices-vortex PRIVATE ${VORTEX_PREFIX}/runtime/libvortex.so ${PTHREAD_LIBRARY})
+  set_property(TARGET pocl-devices-vortex PROPERTY IMPORTED_NO_SONAME TRUE)
 endif()
 
 install(FILES "kernel_main.c" "kernel_args.h"