Function nginx::EVP_MD_CTX_set_update_fn

pub unsafe extern "C" fn EVP_MD_CTX_set_update_fn(
    ctx: *mut EVP_MD_CTX, 
    update: Option<unsafe extern "C" fn(ctx: *mut EVP_MD_CTX, data: *const c_void, count: size_t) -> c_int>
)