Revert "CMake: remove cereal includes from formatting"
Revert "CMake: remove cereal includes from formatting"

This reverts commit 2c1cc419a04993c0d040f507ee060f91b361a377.

Koensw/allpix-squared,Koensw/allpix-squared,Koensw/allpix-squared,Koensw/allpix-squared