cereal isn't found because cmake should be looking for 'cereal', not 'CEREAL'

[yurivict]

Here.

cereal-1.3.0.10 installs these cmake files:

$ pkg info -l cereal | grep -i cmake
	/usr/local/lib/cmake/cereal/cerealConfig.cmake
	/usr/local/lib/cmake/cereal/cerealConfigVersion.cmake
	/usr/local/lib/cmake/cereal/cerealTargets.cmake

They begin with lowercase cereal.