folly/folley/Checksum.cpp moved to folley/hash/Checksum.cpp seven years ago, causing cmake to fail. [Relevant Commit](https://github.com/facebook/folly/commit/d31633e632ce29818040fbfe30d49f3476a3a00a)
folly/folley/Checksum.cpp moved to folley/hash/Checksum.cpp seven years ago, causing cmake to fail.
Relevant Commit