Update CMakeLists.txt to properly set environment variable before making mutils-serialization, and to handle several relative paths correctly
Update CMakeLists.txt to properly set environment variable before making mutils-serialization, and to handle several relative paths correctly

Derecho-Project/derecho-unified,Derecho-Project/derecho-unified,Derecho-Project/derecho-unified,Derecho-Project/derecho-unified,Derecho-Project/derecho-unified