Warning about gnome-system-monitor and gtkmm-3

[Michael Catanzaro <mcatanzaro gnome org>]

Hi,

Just a warning about GNOME 3.23.x releases:

Right now gnome-system-monitor depends on gtkmm-3, which we do not yet
have in our releases because there has been no gtkmm-4 tarball release
yet, so I've left the gtkmm module and the rest of the *mm universe
using their original names in tarball-conversion for now. In the
meantime, *the jhbuild moduleset has to be hand-edited before release
to change the dependency from gtkmm-3 to plain gtkmm.*

Michael