use prototype for __clear_cache across all linux-arm systems, not just android
use prototype for __clear_cache across all linux-arm systems, not just android

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