Function cb_perform_custom_request

pub unsafe extern "C" fn cb_perform_custom_request<C: CustomDownloadInstance>(
    ctxt: *mut c_void,
    method: *const c_char,
    url: *const c_char,
    header_count: u64,
    header_keys: *const *const c_char,
    header_values: *const *const c_char,
    response: *mut *mut BNDownloadInstanceResponse,
) -> i32