Switching some projects back to DotNetBuild

MSBuild was causing path not found errors from Cake, so switching back for now.

Author: Redth

build.cake

@@ -508,7 +508,7 @@ Task ("genapi").IsDependentOn ("libs-base").IsDependentOn ("externals").Does (()
 		});
 	}
 
-	MSBuild ("./AndroidSupport.TypeForwarders.sln", c => c.Configuration = BUILD_CONFIG);
+	DotNetBuild ("./AndroidSupport.TypeForwarders.sln", c => c.Configuration = BUILD_CONFIG);
 
 	CopyFile ("./support-v4/source/bin/" + BUILD_CONFIG + "/Xamarin.Android.Support.v4.dll", "./output/Xamarin.Android.Support.v4.dll");
 });
@@ -517,7 +517,7 @@ Task ("buildtasks").Does (() =>
 {
 	NuGetRestore ("./support-vector-drawable/buildtask/Vector-Drawable-BuildTasks.csproj");
 
-	MSBuild ("./support-vector-drawable/buildtask/Vector-Drawable-BuildTasks.csproj", c => c.Configuration = BUILD_CONFIG);
+	DotNetBuild ("./support-vector-drawable/buildtask/Vector-Drawable-BuildTasks.csproj", c => c.Configuration = BUILD_CONFIG);
 });