Add missing declarations to pg_config.h.in
Add missing pg_config.h.in declarations from
09be39112654
where the corresponding autoconf/meson declarations were
added.
Reviewed-by: Heikki Linnakangas <hlinnaka@iki.fi>
Discussion: https://postgr.es/m/
70145721-6949-4ABF-BB54-
63F866488DF8@yesql.se