Download ANGLE from the v3 source as v2 is having issues

Author: mattleibow

cake/BuildExternals.cake

@@ -699,8 +699,9 @@ Task ("externals-angle-uwp")
     .WithCriteria (!FileExists (ANGLE_PATH.CombineWithFilePath ("uwp/ANGLE.WindowsStore.nuspec")))
     .Does (() =>
 {
-    var version = GetVersion ("ANGLE.WindowsStore", "release");
-    var angleUrl = $"https://www.nuget.org/api/v2/package/ANGLE.WindowsStore/{version}";
+    var id = "ANGLE.WindowsStore";
+    var version = GetVersion (id, "release");
+    var angleUrl = $"https://api.nuget.org/v3-flatcontainer/{id.ToLower ()}/{version}/{id.ToLower ()}.{version}.nupkg";
     var angleRoot = ANGLE_PATH.Combine ("uwp");
     var angleNupkg = angleRoot.CombineWithFilePath ($"angle_{version}.nupkg");