Remove unused arguments in two GiST subroutines

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: b78364df1850a09ece442a138118f4be1a451366
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2016-06-28T20:01:13Z
Releases: 9.6.0
Remove unused arguments in two GiST subroutines

These arguments became unused in commit 2c03216d8311.  Noticed while
skimming code for unrelated development.

This is cosmetic, so no backpatch.

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