Fix Xamarin.Android.sln build with xbuild#4

Merged

jonpryor merged 3 commits intodotnet:masterfrom radical:fix-build-xbuild

Apr 23, 2016

+18-4

Commits on Apr 22, 2016

Xamarin.Android.sln: Add required projects from external/Java.Interop
Ankit Jain
committed
nuget restore for Java.Interop also
Ankit Jain
committed
Fix Mono.Android.targets - jcw-gen
Ankit Jain
committed