Add includes to make header files self-contained

Peter Eisentraut <peter_e@gmx.net>

Commit: 0689dc3a235a12c58910fba325f0150979d0c81f
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2017-12-26T15:21:27Z
Releases: 11.0
Add includes to make header files self-contained

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