gnulib-tool.py: Follow gnulib-tool changes, part 59.

[Collin Funk]

This patch just modifies the timestamp of 'config.h.in' after
executing 'autoheader'.

I've used the Pathlib touch function which I will admit looks a bit
strange [1]. I've tested it and it should update the timestamps
properly though.

My reasoning for this is that the 'constants.execute' command used
above it is a bit strange. I rather not add more opportunities for it
to break. When --verbose is used sp.call() uses shell=False. When it
is not, shell=True is used. Therefore I don't think we can use it to
call 'autoheader && touch config.h.in'.

I've left that function as-is for now, but I will probably get around
to cleaning it & it's callers eventually.

[1] https://docs.python.org/3/library/pathlib.html#pathlib.Path.touch

Collin

0001-gnulib-tool.py-Follow-gnulib-tool-changes-part-59.patch
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