SL-17635 remove unused variables

indra/llmath/llvolume.cpp

indra/llmessage/lldatapacker.cpp

indra/llmessage/llthrottle.cpp

indra/llprimitive/llmodel.cpp

indra/llui/lllayoutstack.cpp

indra/llwindow/llwindowmacosx.cpp

indra/newview/llfasttimerview.cpp

indra/newview/llinventorymodel.cpp

indra/newview/lllegacyatmospherics.cpp

indra/newview/llmeshrepository.cpp

indra/newview/llmodelpreview.cpp

indra/newview/llpatchvertexarray.cpp

indra/newview/llpresetsmanager.cpp

indra/newview/llsceneview.cpp

indra/newview/llviewertexturelist.cpp

indra/newview/llvopartgroup.cpp

indra/newview/llvovolume.cpp

indra/newview/llworld.cpp