Fixed the aspnetcore50 build

Author: Kai Ruhnau

src/Microsoft.AspNet.Server.Kestrel/KestrelEngine.cs

@@ -34,7 +34,12 @@ public KestrelEngine(ILibraryManager libraryManager)
                     libraryPath,
                     "native",
                     "windows",
+#if ASPNETCORE50
+                    // TODO: This is only temporary. Remove when CoreCLR has a release with the Is64BitProcess member
+                    IntPtr.Size == 8 ? "amd64" : "x86",
+#else
                     Environment.Is64BitProcess ? "amd64" : "x86",
+#endif
                     "libuv.dll");
 
                 nativeBinder = new WindowsNativeBinder(

src/Microsoft.AspNet.Server.Kestrel/project.json

@@ -9,6 +9,7 @@
         "aspnetcore50": {
             "dependencies": {
                 "System.Collections": "4.0.10-beta-*",
+                "System.Console" : "4.0.0-beta-*",
                 "System.Diagnostics.Debug": "4.0.10-beta-*",
                 "System.Diagnostics.TraceSource": "4.0.0-beta-*",
                 "System.Diagnostics.Tracing": "4.0.20-beta-*",