delete lib dir in clean target
delete lib dir in clean target

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