Bug#892388: caffe-contrib: build-depends on GCC 6

[Andreas Beckmann]

Followup-For: Bug #892388
Control: tag -1 pending

Hi,

I just pushed a (build-tested) commit to switch to CUDA 9.2 and GCC 7.
I don't plan to upload it immediately ... so you can update the package
if needed and upload yourself.


Andreas