allow build on mono (#2656)
allow build on mono (#2656)


amichel/akka.net,Silv3rcircl3/akka.net,simonlaroche/akka.net,heynickc/akka.net,amichel/akka.net,heynickc/akka.net,ali-ince/akka.net,ali-ince/akka.net,simonlaroche/akka.net,Silv3rcircl3/akka.net