Catch exceptions by const-ref

indra/llaudio/llaudiodecodemgr.cpp

indra/llcommon/llsdserialize.cpp

indra/llcorehttp/_httpservice.cpp

indra/llcorehttp/bufferarray.cpp

indra/llimage/llimagejpeg.cpp

indra/llimage/llpngwrapper.cpp

indra/llkdu/llimagej2ckdu.cpp

indra/llmath/llvolume.cpp

indra/llmessage/llcorehttputil.cpp

indra/llmessage/llhttpnode.cpp

indra/llprimitive/lldaeloader.cpp

indra/llui/llurlregistry.cpp

indra/llvfs/lldir.cpp

indra/llvfs/lldiriterator.cpp

indra/newview/llappcorehttp.cpp

indra/newview/llappviewer.cpp

indra/newview/llcommandlineparser.cpp

indra/newview/llcompilequeue.cpp

indra/newview/llimprocessing.cpp

indra/newview/llmainlooprepeater.cpp