additional fixes to kernel-doc.py

Hi Jon,

This series comes after:

https://lore.kernel.org/linux-doc/[email protected]/T/#t

it basically contains:

- a regression fix when -none/--none parameter is used;
- some backward-compatibility fixes;
- a fix to KBUILD_BUILD_TIMESTAMP, which also drops importing dateutil (*);
- a cleanup related to man modulename.

(*) despite almost everybody has it installed, dateutil is actually not
part of the official Python libraries, so using it would require an extra dependency check.

While our minimal Python version is 3.9, I opted to make it compatible with Python 3.6, as the only issue preventing 3.6 was a single string function (removesuffix) that can be also served by rstrip().

After those changes, support for 3.6 on kernel-doc.py comes almost for
free: both man and ReST output works with just Python 3.6 installed without any additional modules.

So, no need to change any dependencies at scripts/sphinx-pre-install.

Mauro Carvalho Chehab (6):
scripts/kernel-doc.py: Set an output format for --none scripts/kernel-doc.py: adjust some coding style issues scripts/lib/kdoc/kdoc_parser.py: fix Python compat with < v3.13 scripts/kernel-doc.py: move modulename to man class scripts/kernel-doc.py: properly handle KBUILD_BUILD_TIMESTAMP scripts/lib/kdoc/kdoc_parser.py: remove a python 3.9 dependency

 scripts/kernel-doc.py           |  8 ++-
 scripts/lib/kdoc/kdoc_files.py  | 19 ++-----
 scripts/lib/kdoc/kdoc_output.py | 97 ++++++++++++++++++++++++---------
 scripts/lib/kdoc/kdoc_parser.py | 15 ++---
 4 files changed, 83 insertions(+), 56 deletions(-)

2.48.1