add workaround for buffer overflow on iOS Simulator
add workaround for buffer overflow on iOS Simulator

It seems that the Apple iOS Simulator's stat implementation writes
beyond the end of the struct stat we pass it, which can clobber
unrelated parts of the stack.  Perhaps this is due to some kind of
header/library mismatch, but I've been unable to track it down so far.
The workaround is to give it 8 words more than it should need, where 8
is a number I just made up and seems to work.

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