[AC-1949] borderRadius on Android Views is not shown correct

To make a View Circular, the code on would look like this.

<View borderRadius="10" width="20" height="20" backgroundColor="red"/>

var win = Ti.UI.createWindow({
	backgroundColor : '#FFF'
});

var myView = Ti.UI.createView({
	borderRadius : 10,
	width : 20,
	height : 20,
	backgroundColor : "red"
});
win.add(myView);

win.open();

This works on fine iOS, but on Android the view is drawn as a square with rounded corners. See the attached pictures To make the view Circular on Android, borderRadius can be set to the same as the width/height. But this seems the be a dirty hack.