add note about OpenJDK build infrastructure available on GitHub
add note about OpenJDK build infrastructure available on GitHub

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