Revert "manifest: tag libxml2"
Revert "manifest: tag libxml2"

The Python bindings work again.

This reverts commit c8054eab26fd163aa37d6556a2e9c9be071100d1.

vrutkovs/vrutkovs.github.io,GNOME/gnome-ostree,vrutkovs/vrutkovs.github.io,chergert/gnome-continuous,chergert/gnome-continuous,GNOME/gnome-ostree,chergert/gnome-continuous,GNOME/gnome-ostree,vrutkovs/vrutkovs.github.io