pgsql: postgres_fdw: Reorder C includes.

postgres_fdw: Reorder C includes.

Reorder header files in postgres_fdw.c and connection.c in alphabetical
order.

Author: Etsuro Fujita
Reviewed-by: Alvaro Herrera
Discussion: https://postgr.es/m/CAPmGK17ZmNb-EELqu8LmMh2t2uFdbfWNVDEfDO5-bpejHPONMQ@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/92a88644d2b7208e98d9e913c3a574c5c2fe7b78

Modified Files
--------------
contrib/postgres_fdw/connection.c   | 2 +-
contrib/postgres_fdw/postgres_fdw.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)