Add databases/postgresql-ogr_fdw: PostgreSQL foreign data wrapper for OGR

This PostgreSQL extension implements a Foreign Data Wrapper (FDW) for OGR.

Please note that this version of mysql_fdw works with PostgreSQL 9.3+, and
have some limitations:
Only non-spatial query restrictions are pushed down to the OGR driver.
Spatial restrictions are not pushed down.
OGR connections every time.
All columns are retrieved every time.

WWW: https://github.com/pramsey/pgsql-ogr-fdw

PR: 241199
Submitted by: lbartoletti@tuxfamily.org