Berthold Stoeger 3d4ef92717 Cleanup: make local functions in planner.c of static linkage
A number of functions were not used outside of planner.c.
Make them static.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
2019-08-08 16:26:31 -07:00
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