Werk #14711: OpenBSD agent: Fix computation of free memory

Component	Agent bakery
Title	OpenBSD agent: Fix computation of free memory
Date	Aug 5, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p10 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p28 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Depending on the OpenBSD version, the agent was reporting wrong values for the free memory.

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