Mesa BPO to Stretch breaking Gnome and NVidia drivers

[Julien Aubin <julien.aubin@gmail.com>]

Hi,

As of now the Mesa BPO you brought in breaks both GNOME and NVidia blob.

Could you please either :
- Remove it ?
- Or fix it ?

(How to reproduce :
sudo apt -t stretch-backports install libegl1 libegl1-mesa
while pinning *mesa* )

Thanks