tox.ini: Add slackware-multilib

[mkoeppe]

https://groups.google.com/d/msg/sage-devel/WshDn3e_l3k/oyIVKzOiAwAJ

https://docs.slackware.com/slackware:multilib

Component: porting

Branch/Commit: u/gh-cduston44/tox_ini__add_slackware_multilib @ a995355

Issue created by migration from https://trac.sagemath.org/ticket/29798

[cduston44]

Branch: u/gh-cduston44/tox_ini__add_slackware_multilib

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

a995355

Negleted to add the new write-dockerfile.

[sagetrac-git]

Commit: a995355

[mkoeppe]

comment:3

Are package lists going to be the same for slackware and slackware-multilib?

[cduston44]

comment:4

Replying to @mkoeppe:

Are package lists going to be the same for slackware and slackware-multilib?

That's my plan, since the multilib installation comes from a third party repo, extra lines in the write-dockerfile script are required; you can't simply add the multilib packages to slackware-multilib.txt (I don't think).