This will make a number of things easier in the future, as well as (finally!)
avoiding the Id-smashing problem which has plagued developers for so long.
Boy, I'm glad we're not using sup anymore. This update would have been
insane otherwise.
Our ld is derived from gnu ld which doesn't check the timestamp on
__.SYMDEF. gnu ld is designed to work with gnu ar which doesn't
even have a ranlib option (gnu ar updates __.SYMDEF automatically
if __.SYMDEF already exists, so gnu ld expects __.SYMDEF to be up
to date if it exists).
