Werk #7989: Add build support for Debian Buster

Component	Linux distributions
Title	Add build support for Debian Buster
Date	Jul 25, 2019
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0p20 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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