ATS couldn't find legacy libpcre on modern Linux distros

[ksqrtr]

Hi!

I seems like new Debian 13 ("trixie") doesn't ship any more legacy libpcre (pcre.h header) but a lot of code in the ATS explicitly links with this legacy PCRE library.

[cmcfarlen]

There is a similar issue on RHEL10. We are working to remove this dependency from ATS, but are not quite there yet.