Bug#922479: nvidia-legacy-340xx-kernel-dkms unknown symbols, kernel 4.20.x

[S R Wright]

This really needs to be fixed, at this point legacy NVIDIA graphics 
cards (such as my NVIDIA Corporation GT216M [NVS 5100M]) cannot use the 
legacy driver going past kernel 4.19.

The workaround of course is just to just use nouveau,  which at least 
*is* operational in 4.20.x but which also seems more like capitulation 
than a solution.

-- sRw