Include fix from http://trac.sagemath.org/ticket/17375

Package-Manager: portage-2.2.8-r2
bump 6.4 to 6.4-r1 for the only fix from 6.4.1 that we should practically include. This is mainly so we are not in a mess with regards
to maxima dependencies.

Package-Manager: portage-2.2.8-r2