Minor refactoring of btree_gist code.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 8816af65e4f8285d3ef73158b09490099921f870
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2015-03-26T21:10:10Z
Releases: 9.5.0
Minor refactoring of btree_gist code.

The gbt_var_key_copy function was doing two different things depending on
the boolean argument. Seems cleaner to have two separate functions.

Remove unused argument from gbt_num_compress.

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