[mapguide][MG56][Move/Copy] Fix broken mapagent installation on Linux

[Trevor Wekel]

Artifact MG56 has just been moved from mapguide/Task to mapguide/Defect by user trevorwekel. 

You can view the artifact detail at the following URL:

    https://mapguide.osgeo.org/servlets/Scarab/id/MG56

Details:
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