Update CMakeLists.txt to check for Boost.
Update CMakeLists.txt to check for Boost.

Monotone-Parent: fcd49d3b0c01b8e80e0f422550d6517a71e345ef
Monotone-Revision: 9e2153de74d6a56fced075d2124d2cfb9ae43e09

FrancisRussell/fnv_solver