Clearly we're going to have to tread more carefully for things to settle down,
so consider this RC2 and a much harder freeze. A test mass rebuild was done
here and there are no more “fails to build from source” remaining (thanks to
nobodino for some amazing and relentless testing).

• a/exfatprogs-1.1.3-i586-1.txz
• ap/qpdf-10.4.0-i586-1.txz
• n/bind-9.16.23-i586-1.txz
• x/libdrm-2.4.107-i586-1.txz
  Reverted to 2.4.107 as 2.4.108 does not seem to be completely compatible with
  xorg-server-1.20.13. Fixes xf86-video-vmware failing to build from source.
  Thanks to nobodino.

• ap/lxc-4.0.11-i586-3.txz
  Added some additional packages to the lxc-slackware template:
  bridge-utils, dbus, iptables, libnl3, libpcap.
  Thanks to linux91 for the hints.
• l/python-docutils-0.17.1-i586-3.txz
  Revert to this version for now since 0.18 isn't compatible with Sphinx.
  Thanks to HQuest.
• l/python-markdown-3.3.4-i586-3.txz
  Reverted this to fix the Samba build. The newer versions of Markdown require
  importlib_metadata and zipp, and adding these also fixes the build, but oddly
  the installed PKG-INFO shows version 0.0.0, which I suspect is more breakage
  going on with setuptools. I've tried rebuilding all other Python modules here
  to see if a more general breakage had crept in somehow, but those are the
  only two Python modules I've found that exhibit this issue, and I've found
  other similar reports (but no fixes). Markdown-3.3.4 seems to be the safe bet
  for now.