Function mtbl_sys::mtbl_sorter_options_set_merge_func

pub unsafe extern "C" fn mtbl_sorter_options_set_merge_func(
    options: *mut mtbl_sorter_options, 
    merge_fp: extern "C" fn(_: *mut c_void, _: *const u8, _: size_t, _: *const u8, _: size_t, _: *const u8, _: size_t, _: *mut *mut u8, _: *mut size_t), 
    clos: *mut c_void
)