Does not build with gcc C23 standard

[Milan Crha]

	Hi,
attached is a patch, which will make the SynEvolution build also with
the C23 standard. The thing is that standard has the 'bool' as a
keyword.

I would propose the change in the 
https://gitlab.freedesktop.org/SyncEvolution/syncevolution/-/merge_requests
but I see there is a stale merge request, thus I decided to send it
here instead. I can turn this into a merge request, if needed.

	Bye,
	Milan
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