A repo for backported Liquorix kernels

[stevepusser]

Since the Liquorix headers package in the main liquorix repository now requires gcc-7, which is not in Debian Jessie or Stretch, I've backported the packages to use the default gcc in those and some Ubuntu releases.

http://techpatterns.com/forums/post-12752.html#12752

As always, keep your standard Debian kernel as a backup boot option.