Do not package GtkSourceView 3.99, package GtkSourceView 3.24

[Sébastien Wilmet <swilmet gnome org>]

Hi,

The roadmap has all the details:
https://wiki.gnome.org/Projects/GtkSourceView/RoadMap
(see the section "GtkSourceView 4, GtkSourceView 5 and GTK+ 4")

I've just released GtkSourceView 3.24, which you can package as usual
(as "GtkSourceView 3").

But there are also GtkSourceView 3.99.x tarballs. Those are intermediate
versions for GtkSourceView 4.0, but the 4.0 version is not ready. It'll
be released hopefully next cycle, for GNOME 3.26. So, do not package the
3.99 version.

Thanks,
Sébastien