Silence another create_index regression test failure.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 11a83bbedd73800db70f6f2af5a8eb10d15d39d7
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2015-05-15T18:24:23Z
Releases: 9.5.0
Silence another create_index regression test failure.

More platform differences in the less-significant digits in output.

Per buildfarm member rover_firefly, still.

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