Merge downstream code, version 3.8.5

.hgtags

indra/llcommon/CMakeLists.txt

indra/llcommon/llcallbacklist.cpp

indra/llcommon/llcallbacklist.h

indra/llcommon/llmemory.h

indra/llcommon/llmutex.h

indra/llcommon/llstl.h

indra/llmath/llvolume.cpp

indra/llmath/llvolume.h

indra/llmath/m4math.cpp

indra/llmath/m4math.h

indra/llprimitive/CMakeLists.txt

indra/llprimitive/lldaeloader.cpp

indra/llprimitive/lldaeloader.h

indra/llprimitive/llmodel.cpp

indra/llprimitive/llmodel.h

indra/llprimitive/llmodelloader.cpp

indra/llprimitive/llmodelloader.h

indra/llprimitive/lltextureentry.h

indra/newview/CMakeLists.txt