Add easyloggingpp v8.91 as a dependency
Add easyloggingpp v8.91 as a dependency

The reason we are using such an old version is because we cannot use
C++11 features, which are required to compile easylogging version 9.x.

mlalic/lepp2,mlalic/lepp2,sahandy/lepp2,sahandy/lepp2