Avoid direct cross-module links in hstore_plperl and ltree_plpython, too.

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

Commit: eda04886c1e048d695728206504ab4198462168e
Author: Tom Lane <tgl@sss.pgh.pa.us>
Date: 2016-10-04T21:49:07Z
Releases: 10.0
Avoid direct cross-module links in hstore_plperl and ltree_plpython, too.

Just turning the crank on the project started in commit d51924be8.
These cases turn out to be exact subsets of the boilerplate needed
for hstore_plpython.

Discussion: <2652.1475512158@sss.pgh.pa.us>

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