Vadim Zeitlin 28d738e44a Ensure that updating the file preserves its mode ...

Preserve the file mode when replacing it, this notably keeps
docs/doxygen/regen.sh executable when running misc/scripts/inc_year.

This uses GNU chmod --reference option which is not available on all
systems, but it shouldn't be a problem in practice.

2020-03-06 00:54:46 +01:00

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