IgorB:

I don't know if it is possible and I guess not, otherwise GG would have
already implemented this, but would it be possible to use a special
command to run cin, to make it work without the new library? Consider
that I am speaking without knowing which library it used before.

Check to see if you have vdpau library installed.  GG is going to build Ubuntu16 without libva today but since ./cin stops on the first missing library, he can not tell if it will now stop on libvpdau instead or if you have that installed - he did notice that quite a few of the distros come automatically installed with libvdpau already.  He does builds all day long while developing so it is no trouble.
 
Before this last month's build, I interrogated him over and over to see exactly how to avoid this missing library issue and there was no way to do so (otherwise I would have had him implement it!!)  gg/phyllis