PATCH: Configure x86_64 in sysdeps/x86_64/preconfigure

[Roland McGrath]

You haven't said why you think these things need to be done in a
preconfigure fragment rather than a configure fragment.

The only intended purpose of preconfigure fragments is things that
influence the selection of sysdeps directories.  If it appears that
anything else needs to go there for configure to do its job correctly,
then that points to a problem we want to explore explicitly rather than
paper over.


Thanks,
Roland