* Set stx_mode to None if STATX_TYPE|STATX_MODE is missing from
stx_mask.
* Enhance os.statx() tests.
* statx_result structure: remove atime_sec, btime_sec, ctime_sec and
mtime_sec members. Compute them on demand when stx_atime,
stx_btime, stx_ctime and stx_mtime are read.
* Doc: fix statx members sorting.
This amends 4e7e2dd043 to catch errors
that `os.getlogin` can raise as specified by POSIX and Linux/glibc [1].
[1]: https://man7.org/linux/man-pages/man3/getlogin.3.html#ERRORS
---------
Signed-off-by: yihong0618 <zouzou0208@gmail.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>