Evaluate a grsec kernel from spender's build service in Tails

Originally created by @intrigeri on #8600 (Redmine)

add the needed .deb’s from spender’s build service to config/chroot_local-packages/
modify --linux-packages= in auto/config
try building an ISO
apply any needed dirty hack until the ISO builds and boots (e.g. it might be needed, for this first iteration, to disable building dkms modules, disable syslinux CPU architecture autodetection, etc.)
boot the resulting ISO
manually test some features
run the automated test suite against that ISO
report back :)

Edited May 15, 2020 by intrigeri

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