The qpress library is only needed for xtrabackup compression. The compression only occurs when a new node is joining the cluster which shouldn't happen very often. The variable is set to true only when the architecture is x86_64 since that's the only arch that's supported by the upstream repository and CentOS and Ubuntu do not provide qpress in the downstream distributions at all. Change-Id: Iae8b5d0e0998c85ee453efc6620940c80243540e
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