Large cleanup of old warning supressions

indra/llappearance/llavatarappearance.cpp

indra/llcommon/llevents.h

indra/llcommon/llleap.cpp

indra/llcommon/llstacktrace.cpp

indra/llcommon/llsys.cpp

indra/llmath/v3color.h

indra/llxml/llcontrol.h

indra/newview/llappearancemgr.cpp

indra/newview/llappviewer.cpp

indra/newview/llcallingcard.cpp

indra/newview/llfloaterbuycurrency.cpp

indra/newview/llfloaterbuyland.cpp

indra/newview/llfloatersellland.cpp

indra/newview/llgroupmgr.cpp

indra/newview/llimprocessing.cpp

indra/newview/lllogchat.cpp

indra/newview/llmediadataclient.cpp

indra/newview/llpanellogin.cpp

indra/newview/llparticipantlist.cpp

indra/newview/llviewerprecompiledheaders.h