return XToolkit from iOS getPreferredToolkit stub
return XToolkit from iOS getPreferredToolkit stub

This is necessary to prevent an NPE in Hashtable.put when
System.initProperites tries to put a null value in the map for
java.awt.graphicsenv.

lwahlmeier/avian,minor-jason/avian,joshuawarner32/avian,dicej/avian,lostdj/avian,getlantern/avian,bgould/avian,bgould/avian,bigfatbrowncat/avian-pack.avian,dicej/avian,minor-jason/avian,bigfatbrowncat/avian-pack.avian,getlantern/avian,marcinolawski/avian,bigfatbrowncat/avian-pack.avian,dicej/avian,lwahlmeier/avian,bigfatbrowncat/avian-pack.avian,bgould/avian,ucdseniordesign/avian,joshuawarner32/avian,joshuawarner32/avian,lostdj/avian,MaartenR/avian,lostdj/avian,ucdseniordesign/avian,joshuawarner32/avian,MaartenR/avian,getlantern/avian,MaartenR/avian,lwahlmeier/avian,marcinolawski/avian,getlantern/avian,lostdj/avian,ucdseniordesign/avian,bgould/avian,marcinolawski/avian,dicej/avian,minor-jason/avian,ucdseniordesign/avian,marcinolawski/avian,MaartenR/avian,lwahlmeier/avian,minor-jason/avian