libpq: system-wide root.crt

Hello PostgreSQL developers,

I received a request to support system-wide root certificates in
libpq. Right now it only looks in ~/.postgresql/root.crt, but since
such certificates are usually set up system wide and be maintained by
the sysadmins, it would be very convenient if there was a fallback
lookup in /etc/postgresql/ or similar.

Would you accept a patch which adds a configure option for the path of
a system wide root certificate?

Thank you,

Martin

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Martin Pitt                        | http://www.piware.de
Ubuntu Developer (www.ubuntu.com)  | Debian Developer  (www.debian.org)