Fixed broken .NET 3.5/SL builds due to previous commit (r865 - No PIA support).
Fixed broken .NET 3.5/SL builds due to previous commit (r865 - No PIA support).

oconics/Autofac,twsouthwick/Autofac,jango2015/Autofac,pagebrooks/Autofac,LexxFedoroff/Autofac,zjmpds/Autofac,jruckert/Autofac,oconics/Autofac,csantero/Autofac,lijianguang/Autofac,twsouthwick/Autofac,neoe1984/https-github.com-autofac-Autofac,liujunhua/Autofac,twsouthwick/Autofac,pagebrooks/Autofac,laizhan/autofac,onovotny/Autofac,zmaruo/Autofac,twsouthwick/Autofac,onovotny/Autofac,liujunhua/Autofac,csantero/Autofac,twsouthwick/Autofac,laizhan/autofac,SeriaWei/Autofac,laizhan/autofac,autofac/Autofac,LexxFedoroff/Autofac,jruckert/Autofac,SeriaWei/Autofac,laizhan/autofac,neoe1984/https-github.com-autofac-Autofac