Function lv_image_header_cache_resize 

pub unsafe extern "C" fn lv_image_header_cache_resize(
    count: u32,
    evict_now: bool,
)

Resize image header cache. If set to 0, the cache is disabled. @param count new max count of cached image headers. @param evict_now true: evict the image headers should be removed by the eviction policy, false: wait for the next cache cleanup.