Fix assorted compilation failures in contrib

Evidently I failed to test a compile after my earlier header shuffling.

Branch
------
master

Details
-------
http://git.postgresql.org/pg/commitdiff/9df55c8c3f0eba77de57006999d5700292fa9d33

Modified Files
--------------
contrib/auto_explain/auto_explain.c |    2 ++
contrib/dblink/dblink.c             |    1 +
contrib/pageinspect/fsmfuncs.c      |    6 ++++--
contrib/tablefunc/tablefunc.c       |    3 ++-
4 files changed, 9 insertions(+), 3 deletions(-)

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