Re: pgsql: Don't trust unvalidated xl_tot_len.

Re: Thomas Munro
> But then why does that only happen on the salsa build,
> not on the apt.postgresql.org one?

The build chroots there have postgresql-NN already installed so
extension builds don't have to download 7 PG versions over and over.
My guess would be that that's the difference and it's using some
pg_config from /usr/bin or /usr/lib/postgresql/*/bin.

I can confirm that it's also failing in my local chroots if none of
the postgresql-* packages are preinstalled.

Christoph