CMake tweak to help avoid installed pangolin errors.
CMake tweak to help avoid installed pangolin errors.

wxdzju/Pangolin,tschmidt23/Pangolin,stevenlovegrove/Pangolin,randi120/Pangolin,pinglin/Pangolin,arpg/Pangolin,pinglin/Pangolin,contradict/Pangolin,renzodenardi/Pangolin,visigoth/Pangolin,contradict/Pangolin,janjachnik/Pangolin,mp3guy/Pangolin,janjachnik/Pangolin,arpg/Pangolin,tschmidt23/Pangolin,visigoth/Pangolin,mp3guy/Pangolin,wxdzju/Pangolin,renzodenardi/Pangolin,mp3guy/Pangolin,randi120/Pangolin,stevenlovegrove/Pangolin,stevenlovegrove/Pangolin,GrimDerp/Pangolin,tschmidt23/Pangolin,GrimDerp/Pangolin