try to work around some broken heic images
try to work around some broken heic images

see https://github.com/libvips/libvips/issues/1574

jcupitt/libvips,lovell/libvips,jcupitt/libvips,jcupitt/libvips,lovell/libvips,jcupitt/libvips,lovell/libvips,lovell/libvips