added elpp to building blocks version
added elpp to building blocks version

spthaolt/easyloggingpp,arvidsson/easyloggingpp,spqr33/easyloggingpp,lisong521/easyloggingpp,arvidsson/easyloggingpp,chenmusun/easyloggingpp,hellowshinobu/easyloggingpp,spthaolt/easyloggingpp,spqr33/easyloggingpp,blankme/easyloggingpp,dreal-deps/easyloggingpp,simonhang/easyloggingpp,blankme/easyloggingpp,spqr33/easyloggingpp,hellowshinobu/easyloggingpp,lisong521/easyloggingpp,chenmusun/easyloggingpp,spthaolt/easyloggingpp,lisong521/easyloggingpp,blankme/easyloggingpp,simonhang/easyloggingpp,arvidsson/easyloggingpp,dreal-deps/easyloggingpp,utiasASRL/easyloggingpp,simonhang/easyloggingpp,dreal-deps/easyloggingpp,utiasASRL/easyloggingpp,chenmusun/easyloggingpp,hellowshinobu/easyloggingpp,utiasASRL/easyloggingpp