[DesignTools.makeBlackBox()] Fix for #967 #970
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When preparing a design to create a black box and ensure that the routing of the surrounding logic remains intact, sometimes the tool will attempt to insert a LUT1 as a way to preserve existing routing. #967 stumbled on a bug where the tool found a scenario that fit the criteria for inserting a LUT1, but was not actually necessary as the source of the FF routing was actually internal to the SLICE (a GND post available for only
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