buildroot

postgresql: add replacement pg_config

Normally pg_config is a native application compiled for the
target architecture. Since we cannot execute those on the
host system, provide a simple shell script as replacement.

Signed-off-by: Floris Bos <bos@je-eigen-domein.nl>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>