Function glib_sys::g_uri_unescape_bytes

pub unsafe extern "C" fn g_uri_unescape_bytes(
    escaped_string: *const c_char, 
    length: ssize_t, 
    illegal_characters: *const c_char, 
    error: *mut *mut GError
) -> *mut GBytes

This is supported on crate feature v2_66 only.