CUDA: Restore device linking to imported static library targets

This ability was lost in commit 81b4d10d (CUDA: More exhaustive checks
to determine when to do device linking, 2019-05-09, v3.15.0-rc1~82^2)
and needs to be restored to use imported static libraries that have CUDA
symbols.
15 jobs for restore_imported_library_device_linking
Status Job ID Name Coverage
  External
passed ghostflow-check-master

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager

passed ghostflow-stager