[GRASS5] PostgreSQL interface compilation

[Markus Neteler]

Hi,

(thanks Alex, for re-adding the missing files). I tried
to compile the
src.garden/grass.postgresql
today, but there is a problem with
#include <postgres_fe.h>
that is named postgres.h on Redhat. It seems that the name
depends on the PostgreSQL version and the Linux distro.
Can we add some trick to support both filenames or
find out the name with "configure"?

I am not sure how to fix this problem (appears in g.column.pg).

Thanks for help,

 Markus