Fix inclusions of postgres_fe.h from .h files.

Tom Lane <tgl@sss.pgh.pa.us>

Commit: 9722bb5757c5e90617be685bf127911b63efe08d
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2017-03-09T01:41:06Z
Releases: 10.0
Fix inclusions of postgres_fe.h from .h files.

We have a project policy that every .c file should start by including
postgres.h, postgres_fe.h, or c.h as appropriate; and then there is no
need for any .h file to explicitly include any of these.  Fix a few
headers that were violating this policy by including postgres_fe.h.

Discussion: https://postgr.es/m/CAEepm=2zCoeq3QxVwhS5DFeUh=yU6z81pbWMgfOB8OzyiBwxzw@mail.gmail.com
Discussion: https://postgr.es/m/11634.1488932128@sss.pgh.pa.us

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