Rename comparePos() to compareWordEntryPos()

Teodor Sigaev <teodor@sigaev.ru>

Commit: 4e55b3f0335c2aa658cd9d1fda4dea2a1f9ab80d
Author: Teodor Sigaev <teodor@sigaev.ru>
Date: 2016-04-08T09:04:15Z
Releases: 9.6.0
Rename comparePos() to compareWordEntryPos()

Rename comparePos() to compareWordEntryPos() to prevent export of too
generic name.

Per gripe from Tom Lane.

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