mono/mono — pull request #1364 by muojp (2014-10-25 13:41:46+00:00)
Title: Add a simple proxy ctor to improve .NET 4.5 compatibility

- Ref: https://bugzilla.xamarin.com/show_bug.cgi?id=20048
- It's new one added in .NET 4.5
- Absence of this ctor prevents KestrelHttpServer (web server for ASP.NET vNext: https://github.com/aspnet/KestrelHttpServer ) test code from working
- I hesitated to put IPv4 only implementation, but whole dual stack (IPv4/v6) support would need bunch of works to be done. So, I pinned protocol to IPv4