[exim-dev] buildfarm animals

The 4.next branch is now expecting the pcre2 library, replacing the original
pcre library; the latter having gone end-of-life.

Buildfarm animal maintainers, please check that the required packages
are installed to support this. The buildfarm status page entry for
your animal will go red if not.

https://buildfarm.exim.org/cgi-bin/show_status.pl

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Cheers,
Jeremy